[E-Type] Tach issue, questions

Tach dropped to zero yesterday while stopped at a red light.

There’s a black, rectangular junction (which has resisted my
attempts to separate it) with 2 White and 1 Green wire going
to the tach. With the engine running, I’ve got steady battery
voltage between the Green and each White wire on both sides.
At the coil, I’ve got battery voltage (13.5v) at one spade
and about 9v at the other.

I’m thinking this means the fault is internal to the tach?–
'69 OTS Morris County NJ USA
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In reply to a message from AJC-69 sent Wed 2 Apr 2014:

There is a white plastic slide lock that must be removed to
separate the plug. What is your name?–
The original message included these comments:

attempts to separate it) with 2 White and 1 Green wire going
to the tach. With the engine running, I’ve got steady battery


George Camp
Columbia SC, United States
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In reply to a message from George Camp sent Wed 2 Apr 2014:

Sorry, didn’t mean to be anonymous - Anthony

‘‘White plastic slide lock’’ ?
There’s a whitish/clear piece of plastic between the
side-by-side white wires on each end. There’s also a
protrusion on each black plastic plug where they meet,
but nothing holding those together. Does the whitish/clear
piece slide out of one end?

Electrically, does it seem that I’ve got power/signal
to the tach?–
The original message included these comments:

In reply to a message from AJC-69 sent Wed 2 Apr 2014:
There is a white plastic slide lock that must be removed to
separate the plug. What is your name?
The original message included these comments:

attempts to separate it) with 2 White and 1 Green wire going
to the tach. With the engine running, I’ve got steady battery


Anthony 1969 S2 OTS Morris County NJ USA
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In reply to a message from AJC-69 sent Wed 2 Apr 2014:

One of the white wires runs to the coil with the other
white wire running to fuse#7.The green wire is power for
the tach itself and connects to fuse #7 as well. Make sure
your connections are bright and tight.The tach on my 69 did
not work when I recently purchased it and unfortunately had
to send it away for repair after trouble shooting indicated
the tach itself was non functioning.If you are brave google
tach repair as many times it is a capacitor that fails and
it can be easily replaced as per instructions. Good luck!–
Alan Dell
Niagara Falls, Canada
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In reply to a message from AJC-69 sent Wed 2 Apr 2014:

Anthony - my tach started an intermittant fault. It turned out to
be a problem with continuity across the #7 fuse block. Another
related fault was that the cooling fans stopped working at the same
time.

Troubleshoot with a small gauge wire jumer wire across the fuse
holder. If tach starts working when jumped its the fuse holders. I
tried cleaning, and increasing clamping pressure on the fuse to no
avail.

4 new fuse holders from SNG cured the issue and ended other
intermittant ‘‘electrical gremlins’’ I was chasing.
Dave–
1969 BRG OTS
Skaneateles, NY, United States
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In reply to a message from David Ahlers sent Thu 3 Apr 2014:

My tach is alive again thanks to your suggestions!

I opened/cleaned the tach wiring block as per George’s
instructions and checked continuity across the fuse block
as suggested by Dave. Oddly, it wasn’t the Fuse #7 block -
it was Fuse #6. Cleaning #6 spades/connector solved the
problem.–
Anthony 1969 S2 OTS Morris County NJ USA
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In reply to a message from AJC-69 sent Thu 3 Apr 2014:

Did it from memory, sorry about the #6 vs #7.
But my advise would be to replace all the fuse blocks. The problem
kept reoccuring. Haven’t touched it since.
D–
1969 BRG OTS
Skaneateles, NY, United States
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