My tachometer quit working a few weeks ago so last night
I decided to pull it out and take it apart. I re-soldered all the
contacts, cleaned with electric parts cleaner, lubed the shaft
with white litho spray, cleaned the lens and reinstalled. Still
no tach. readings. Do these go bad or should I look for a
wiring or fuse problem? Any suggestions? I know I’ll have
to clean the rest of the gauges now because the lens and
face plate looks better than the rest. I wonder what other
can of worms I can open?
DANNY,
Have you checked the wiring /or connectors to the tachometer ? Pretty
simple, really. Do you have a test light ? I’ll assume “yes”. Green wire to
tach should have power anytime ignition is “on”. Black wire is “ground” as
per normal, and white/gray/blue wire is signal from ignition coil, “-” post.
You should have power here, too, with engine running. If there is a wiring
problem I would first suspect this coil wire. I’ve seen a number of Jags
where coil wiring is pretty fried and crispy (age, engine heat, etc).If all
the READILY VISIBLE wiring looks good but you still suspect a wiring fault
you can run a temporary parallel circuit from coil to tach in a few minutes
just to see what happens.Or, it is a simple matter to check wiring
continuity with an ohm meter. No ohm meter ? No sweat. Disconnect wire at
both ends, apply power at one end, check with test light at the other. (of
course this is pretty rudimentary since resistance can’t be checked. But
you’ll find out if there’s a blatant “open” in the wire.) Also, from the
various comments I’ve read, pay particular attention to the bulkhead
connector directly behind battery – it’s a pretty tough environment for
wiring. If all wiring checks ok, then I’d say it’s time to have your tach
repaired.
Hope this helps a little,
Doug----- Original Message -----
From: Danny Herrin dannyherrin@istmacon.net
To: xj@jag-lovers.org
Sent: Thursday, February 17, 2000 3:03 PM
Subject: [xj] Tachometer
My tachometer quit working a few weeks ago so last night
I decided to pull it out and take it apart. I re-soldered all the
contacts, cleaned with electric parts cleaner, lubed the shaft
with white litho spray, cleaned the lens and reinstalled. Still
no tach. readings. Do these go bad or should I look for a
wiring or fuse problem? Any suggestions? I know I’ll have
to clean the rest of the gauges now because the lens and
face plate looks better than the rest. I wonder what other
can of worms I can open?
Doug: Thanks for the great help! I didn’t know which wire
went where from the tach so I’ll tackle that this weekend for
sure. The only part I didn’t quite understand was the part
about the bulkhead connector behind the battery. Can you
explain please?
Thanks again!!
Danny----- Original Message -----
From: “DOUGLAS DWYER” DWYERD@email.msn.com
To: “Danny Herrin” <@Danny_Herrin1>
Cc: xj@jag-lovers.org
Sent: Friday, February 18, 2000 12:39 AM
Subject: Re: [xj] Tachometer
DANNY,
Have you checked the wiring /or connectors to the tachometer ? Pretty
simple, really. Do you have a test light ? I’ll assume “yes”. Green wire
to
tach should have power anytime ignition is “on”. Black wire is “ground” as
per normal, and white/gray/blue wire is signal from ignition coil, “-”
post.
You should have power here, too, with engine running. If there is a wiring
problem I would first suspect this coil wire. I’ve seen a number of Jags
where coil wiring is pretty fried and crispy (age, engine heat, etc).If
all
the READILY VISIBLE wiring looks good but you still suspect a wiring fault
you can run a temporary parallel circuit from coil to tach in a few
minutes
just to see what happens.Or, it is a simple matter to check wiring
continuity with an ohm meter. No ohm meter ? No sweat. Disconnect wire at
both ends, apply power at one end, check with test light at the other. (of
course this is pretty rudimentary since resistance can’t be checked. But
you’ll find out if there’s a blatant “open” in the wire.) Also, from the
various comments I’ve read, pay particular attention to the bulkhead
connector directly behind battery – it’s a pretty tough environment for
wiring. If all wiring checks ok, then I’d say it’s time to have your tach
repaired.
Hope this helps a little,
Doug
----- Original Message -----
From: Danny Herrin <@Danny_Herrin1>
To: xj@jag-lovers.org
Sent: Thursday, February 17, 2000 3:03 PM
Subject: [xj] Tachometer
My tachometer quit working a few weeks ago so last night
I decided to pull it out and take it apart. I re-soldered all the
contacts, cleaned with electric parts cleaner, lubed the shaft
with white litho spray, cleaned the lens and reinstalled. Still
no tach. readings. Do these go bad or should I look for a
wiring or fuse problem? Any suggestions? I know I’ll have
to clean the rest of the gauges now because the lens and
face plate looks better than the rest. I wonder what other
can of worms I can open?
Danny, there are two big screws on the firewall for battery “+” connections –
one on each side of the engine. The one Danny mentions is down between the
battery and transmission – the “+” battery lead goes directly to it. This
and the one on the other side should be disassembled, cleaned and lightly
oiled before reassembly, if there’s any question about good contacts. You can
check with a multimeter on the low range (1.5V) – when the starter cranks the
engine, there should be well below .5V drop from the battery terminal to the
starter solenoid’s power contact, or below half that to the post on the
firewall.
Alex
79xj6L SII
Danny Herrin wrote:>
Doug: Thanks for the great help! I didn’t know which wire
went where from the tach so I’ll tackle that this weekend for
sure. The only part I didn’t quite understand was the part
about the bulkhead connector behind the battery. Can you
explain please?
Thanks again!!
Danny
DANNY,
Have you checked the wiring /or connectors to the tachometer ? Pretty
simple, really. Do you have a test light ? I’ll assume “yes”. Green wire
to
tach should have power anytime ignition is “on”. Black wire is “ground” as
per normal, and white/gray/blue wire is signal from ignition coil, “-”
post.
You should have power here, too, with engine running. If there is a wiring
problem I would first suspect this coil wire. I’ve seen a number of Jags
where coil wiring is pretty fried and crispy (age, engine heat, etc).If
all
the READILY VISIBLE wiring looks good but you still suspect a wiring fault
you can run a temporary parallel circuit from coil to tach in a few
minutes
just to see what happens.Or, it is a simple matter to check wiring
continuity with an ohm meter. No ohm meter ? No sweat. Disconnect wire at
both ends, apply power at one end, check with test light at the other. (of
course this is pretty rudimentary since resistance can’t be checked. But
you’ll find out if there’s a blatant “open” in the wire.) Also, from the
various comments I’ve read, pay particular attention to the bulkhead
connector directly behind battery – it’s a pretty tough environment for
wiring. If all wiring checks ok, then I’d say it’s time to have your tach
repaired.
Hope this helps a little,
Doug
----- Original Message -----
From: Danny Herrin dannyherrin@istmacon.net
To: xj@jag-lovers.org
Sent: Thursday, February 17, 2000 3:03 PM
Subject: [xj] Tachometer
My tachometer quit working a few weeks ago so last night
I decided to pull it out and take it apart. I re-soldered all the
contacts, cleaned with electric parts cleaner, lubed the shaft
with white litho spray, cleaned the lens and reinstalled. Still
no tach. readings. Do these go bad or should I look for a
wiring or fuse problem? Any suggestions? I know I’ll have
to clean the rest of the gauges now because the lens and
face plate looks better than the rest. I wonder what other
can of worms I can open?
I have had two go and both had the same problem. Open the back and you will
see the wires are soldered to a small circuit board. The input wire runs
along a track and then into a regulator and then into the coil part of the
meter. The problem is that the track before the regulator burns out. If it
is this, you should be able to see it and the remedy is to cut the wire and
solder directly to the regulator leg thus bypassing the track. Particurlarly
happens if you are running an aftermarket ignition system or non standard
coils.
PJ----- Original Message -----
From: Danny Herrin dannyherrin@istmacon.net
To: xj@jag-lovers.org
Sent: Thursday, February 17, 2000 11:03 PM
Subject: [xj] Tachometer
My tachometer quit working a few weeks ago so last night
I decided to pull it out and take it apart. I re-soldered all the
contacts, cleaned with electric parts cleaner, lubed the shaft
with white litho spray, cleaned the lens and reinstalled. Still
no tach. readings. Do these go bad or should I look for a
wiring or fuse problem? Any suggestions? I know I’ll have
to clean the rest of the gauges now because the lens and
face plate looks better than the rest. I wonder what other
can of worms I can open?
DANNY
Re: bulkhead connector. Sorry, I wasn’t very specific. On the firewall, just
to the right and slightly to the rear of the battery is a pass-thru
connector with a whole slew of wires. This is where wires come thru the
firewall and in/out of cabin. The proximity to the battery takes a toll on
the wiring. Just looked at mine as a matter of fact. Time for a good
cleaning in that area.BTW, there is a similar bulkhead connector on the
opposite side of the car.
Did you see the posting from other lister regarding internal tach repair ?
Sounds pretty good to me !
After only a few days on this list I’m convinced that there is no Ser III
problem imaginable that couldn’t be solved by the information and experience
available from this list !
My admiration and respect to all.
Doug Dwyer----- Original Message -----
From: Danny Herrin dannyherrin@istmacon.net
To: DOUGLAS DWYER <@Doug_Dwyer>
Cc: xj@jag-lovers.org
Sent: Friday, February 18, 2000 7:18 AM
Subject: Re: [xj] Tachometer
Doug: Thanks for the great help! I didn’t know which wire
went where from the tach so I’ll tackle that this weekend for
sure. The only part I didn’t quite understand was the part
about the bulkhead connector behind the battery. Can you
explain please?
Thanks again!!
Danny
----- Original Message -----
From: “DOUGLAS DWYER” <@Doug_Dwyer>
To: “Danny Herrin” dannyherrin@istmacon.net
Cc: xj@jag-lovers.org
Sent: Friday, February 18, 2000 12:39 AM
Subject: Re: [xj] Tachometer
DANNY,
Have you checked the wiring /or connectors to the tachometer ? Pretty
simple, really. Do you have a test light ? I’ll assume “yes”. Green wire
to
tach should have power anytime ignition is “on”. Black wire is “ground”
as
per normal, and white/gray/blue wire is signal from ignition coil, “-”
post.
You should have power here, too, with engine running. If there is a
wiring
problem I would first suspect this coil wire. I’ve seen a number of Jags
where coil wiring is pretty fried and crispy (age, engine heat, etc).If
all
the READILY VISIBLE wiring looks good but you still suspect a wiring
fault
you can run a temporary parallel circuit from coil to tach in a few
minutes
just to see what happens.Or, it is a simple matter to check wiring
continuity with an ohm meter. No ohm meter ? No sweat. Disconnect wire
at
both ends, apply power at one end, check with test light at the other.
(of
course this is pretty rudimentary since resistance can’t be checked. But
you’ll find out if there’s a blatant “open” in the wire.) Also, from the
various comments I’ve read, pay particular attention to the bulkhead
connector directly behind battery – it’s a pretty tough environment for
wiring. If all wiring checks ok, then I’d say it’s time to have your
tach
repaired.
Hope this helps a little,
Doug
----- Original Message -----
From: Danny Herrin dannyherrin@istmacon.net
To: xj@jag-lovers.org
Sent: Thursday, February 17, 2000 3:03 PM
Subject: [xj] Tachometer
My tachometer quit working a few weeks ago so last night
I decided to pull it out and take it apart. I re-soldered all the
contacts, cleaned with electric parts cleaner, lubed the shaft
with white litho spray, cleaned the lens and reinstalled. Still
no tach. readings. Do these go bad or should I look for a
wiring or fuse problem? Any suggestions? I know I’ll have
to clean the rest of the gauges now because the lens and
face plate looks better than the rest. I wonder what other
can of worms I can open?
DANNY,
Internal tach repair ? Way over my head ! Check out reply to your original
post from Phil Jones. It’s “been there, done that” for him ! If it were me
(I’m pretty chicken) I would first find out how much a replacement/exchange
tach is gonna be. Then I’d know if I’m ruining something priceless or just
experimenting with a cheap, easy to replace component.
Good Luck,
Doug
PS-did you try the archives ?----- Original Message -----
From: Danny Herrin dannyherrin@istmacon.net
To: DOUGLAS DWYER <@Doug_Dwyer>
Sent: Monday, February 21, 2000 2:42 PM
Subject: Re: [xj] Tachometer
Doug: Thanks again for the info. I checked the wiring out this
weekend and both wires have power going into the tach. as
you pointed out. Do you know how to repair a tach. or at
least trouble shoot one? I have a volt meter but electronics
isn’t my best field, not my worst either.
Thanks
Danny from Missouri
----- Original Message -----
From: “DOUGLAS DWYER” <@Doug_Dwyer>
To: “Danny Herrin” dannyherrin@istmacon.net
Cc: xj@jag-lovers.org
Sent: Friday, February 18, 2000 12:39 AM
Subject: Re: [xj] Tachometer
DANNY,
Have you checked the wiring /or connectors to the tachometer ? Pretty
simple, really. Do you have a test light ? I’ll assume “yes”. Green wire
to
tach should have power anytime ignition is “on”. Black wire is “ground”
as
per normal, and white/gray/blue wire is signal from ignition coil, “-”
post.
You should have power here, too, with engine running. If there is a
wiring
problem I would first suspect this coil wire. I’ve seen a number of Jags
where coil wiring is pretty fried and crispy (age, engine heat, etc).If
all
the READILY VISIBLE wiring looks good but you still suspect a wiring
fault
you can run a temporary parallel circuit from coil to tach in a few
minutes
just to see what happens.Or, it is a simple matter to check wiring
continuity with an ohm meter. No ohm meter ? No sweat. Disconnect wire
at
both ends, apply power at one end, check with test light at the other.
(of
course this is pretty rudimentary since resistance can’t be checked. But
you’ll find out if there’s a blatant “open” in the wire.) Also, from the
various comments I’ve read, pay particular attention to the bulkhead
connector directly behind battery – it’s a pretty tough environment for
wiring. If all wiring checks ok, then I’d say it’s time to have your
tach
repaired.
Hope this helps a little,
Doug
----- Original Message -----
From: Danny Herrin dannyherrin@istmacon.net
To: xj@jag-lovers.org
Sent: Thursday, February 17, 2000 3:03 PM
Subject: [xj] Tachometer
My tachometer quit working a few weeks ago so last night
I decided to pull it out and take it apart. I re-soldered all the
contacts, cleaned with electric parts cleaner, lubed the shaft
with white litho spray, cleaned the lens and reinstalled. Still
no tach. readings. Do these go bad or should I look for a
wiring or fuse problem? Any suggestions? I know I’ll have
to clean the rest of the gauges now because the lens and
face plate looks better than the rest. I wonder what other
can of worms I can open?
Series I XJ6. My tach will not work in the morning. In the afternoon
it functions fine. When I drive faster than 90 mph, the needle starts
to swing back and forth wildly on occasion. There is swishing sound
that emanates from what I believe is the tach cable on cold mornings.
Has anybody had this problem before and if so, as I believe, replacing
the cable should correct my problems.
Correct?
Out of curiosity, since the cable is old and probably not lubricated and
what if any grease that is in there is also gunked up, it could make a
pretty good binding agent on cold mornings causing all sorts of the
types of problems I’m having… true or not?
Series I XJ6. My tach will not work in the morning. In the afternoon
it functions fine. When I drive faster than 90 mph, the needle starts
to swing back and forth wildly on occasion. There is swishing sound
that emanates from what I believe is the tach cable on cold mornings.
Has anybody had this problem before and if so, as I believe, replacing
the cable should correct my problems.
Correct?
Uhm. There is no cable. The tach receives electric signals…
I’m working on a similar problem myself, trying to the the Mallory
distributor, the Crane Hi-6 ignition amp and PS-91 coil to drive the
tach. I’ll admit, between all the new wires and all the gunky old wires,
I’m pretty much lost…
Nick–
Nick Johannessen (@Nickj) / (nick@jagweb.com)
Feral → 1970 XJ6 4.2 MOD LHD/SWB/SPAX+GTJ handling/Mallory+Crane
ignition/XJR-seats
Domestic → 1982 XJ6 4.2 Auto RHD AJ6 Plus Torque’d /GTJ handling
Don’t forget to add your favorite workshop and club at http://www.jagweb.com/search.html
Professional leathercare at Leathermotive! http://www.leathermotive.com
===================================================
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Series I XJ6. My tach will not work in the morning. In the afternoon
it functions fine. When I drive faster than 90 mph, the needle starts
to swing back and forth wildly on occasion. There is swishing sound
that emanates from what I believe is the tach cable on cold mornings.
Has anybody had this problem before and if so, as I believe, replacing
the cable should correct my problems.
Correct?
Out of curiosity, since the cable is old and probably not lubricated and
what if any grease that is in there is also gunked up, it could make a
pretty good binding agent on cold mornings causing all sorts of the
types of problems I’m having… true or not?
DA
===================================================
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Series I XJ6. My tach will not work in the morning…
Has anybody had this problem before and if so, as I believe, replacing
the cable should correct my problems.
Doug:
My S-1 has an electric tach. Are there mechanical ctachs out there in S-1 cars?
Lou
71 XJ6===================================================
To remove yourself from this list, go to Jag-lovers Forums - Jag-lovers