[E-Type] Switched to LED rear lights on series 2, indicator fizzles

Thought I would give the LED light bulbs a try, they work great are
brighter and react quicker. The only problem is the dashboard
indicator will flash brightly the first time then fades out
completly after 3 blinks. The LEDs will be flashing correctly, just
the dash indecator fizzles. I replaced the flasher with a solid
state unit, but that did not work at all. (Maybe I need a BILLET
flasher) Any ideas?

Glenn Wior
70 E–
melloyello
evansville indiana, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–

Search the archives & forums - http://search.jag-lovers.org/
Subscription changes - http://www.jag-lovers.com/cgi-bin/majordomo
Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

In reply to a message from melloyello sent Sun 22 Oct 2006:

Glenn
What about substituting the indicator bulb with a LED? They have
small ones with adaptors to replace dash lights. Maybe all the
bulbs in your turn signal circut need to be LED? I bought some off
Ebay for about $4 ea. I was going to switch them over, but just
haven’t gotten around to it yet.
Joel–
ex jag, '66 E-type S1 4.2, '56 XK140dhc
Denison, TX, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–

Search the archives & forums - http://search.jag-lovers.org/
Subscription changes - http://www.jag-lovers.com/cgi-bin/majordomo
Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

In reply to a message from melloyello sent Sun 22 Oct 2006:

Glenn, The thing about the old flasher units is that they
depend on current flowing in the circuit in order to
operate. And the thing about the LEDs is that they operate
at a much reduced current level.So the equipment is not
comptible. I suspect that the LED lamps were more aimed at
the brake light application.Maybe the supplier can throw
some light on this.Regards.–
The original message included these comments:

Thought I would give the LED light bulbs a try, they work great are
brighter and react quicker. The only problem is the dashboard
indicator will flash brightly the first time then fades out
completly after 3 blinks. The LEDs will be flashing correctly, just
the dash indecator fizzles. I replaced the flasher with a solid
state unit, but that did not work at all. (Maybe I need a BILLET
flasher) Any ideas?
Glenn Wior
70 E


John M Holmes 1973 E Type SIII Supra 5-Speed, 1970 SII OTS
Sarnia, Ontario, Canada
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–

Search the archives & forums - http://search.jag-lovers.org/
Subscription changes - http://www.jag-lovers.com/cgi-bin/majordomo
Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

In reply to a message from John M Holmes sent Sun 22 Oct 2006:

Glenn:

John is correct in that the old style flashers depended on a
certain anount of current flowing to work correctly (which
is why they flash faster if a bulb is burnt out). I believe
that they actually have a bi-metallic contact that heats up
and breaks the contact, cools down and makes the contact
again, etc. That is what also probably makes the ‘‘clicking’’
sound, the contact snapping back and forth.

You might be able to fool the old flasher by just putting a
suitable resistor across the new LED bulb to increase the
current used. You will likely have to remove the assembly to
get to the wires, or you may be able to do this at the dash.
I think the flasher bulbs are Lucas 382 rated at 21 Watts,
which is about 1.75 Amps at 12 V. Using Ohm’s Law, 12
divided by 1.75 yields a typical resistance of 6.9 ohms.
Find out what your LED lamp draws, subtract that from the
1.75 Amps and do the division to get your resistor value. I
would guess something in the range of 10 to 20 ohms would be
OK (depending on the value). Start at the high end. The
resistor has to be big enough to handle the power, something
like 10 to 20 watts should do. The resistor has to be
electrically insulated and it will get warm, so mount it
properly (no fires). Make sure that this works before making
it permanent.

I am surprised that whoever sold you the LED ‘‘bulb’’ didn’t
also supply a suitable flasher, but then you would have to
change all of your bulbs to LEDs.

Good luck.

Mike–
The original message included these comments:

Glenn, The thing about the old flasher units is that they
depend on current flowing in the circuit in order to
operate. And the thing about the LEDs is that they operate
at a much reduced current level.So the equipment is not
comptible. I suspect that the LED lamps were more aimed at
the brake light application.Maybe the supplier can throw
some light on this.Regards.


Mike Form
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–

Search the archives & forums - http://search.jag-lovers.org/
Subscription changes - http://www.jag-lovers.com/cgi-bin/majordomo
Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

In reply to a message from Mike Form sent Sun 22 Oct 2006:

Thanks all for you suggestions
I am very electrically challanged and don’t have the knowledge to
start messing with the system. I did have the same idea that the
LEDs drew less power and that is why I experimented with a solid
state flasher. I will be attempting a 2200 mile trip cross country
next month and do not want to put my new fire extinguisher to the
test. As far as getting knowledgable advise from a parts guy behind
the counter forget it, especially about electrical systems. This
topic could start a very long thread, as soon as I mention a part
is for a Jaguar the responce is NO. I must say at the local NAPA
store they will spend 20 minutes looking for a $2.00 part. This may
not be the situation in a larger city where Jags are more common?

Glenn Wior
70 E–
melloyello
evansville indiana, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–

Search the archives & forums - http://search.jag-lovers.org/
Subscription changes - http://www.jag-lovers.com/cgi-bin/majordomo
Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

Glenn,
The indicator achieves a complete circuit through the turn signal
switch itself. You might try going in there and cleaning the
contacts. Its impossible to see exactly how the circuit operates
using the schematic but those indicators are on a separate circuit
from the turn signals themselves. The common points being the flasher
unit and turn signal switch but as said different circuit path.

One caution with the LEDs. Their arc of visibility is not nearly that
of the bulbs, meaning those directly in front or rear will see them
fine but off to the side they won’t be seen which can be important
when going around a corner.
pauls 67ots

Thought I would give the LED light bulbs a try, they work great are
brighter and react quicker. The only problem is the dashboard
indicator will flash brightly the first time then fades out
completly after 3 blinks. The LEDs will be flashing correctly, just
the dash indecator fizzles. I replaced the flasher with a solid
state unit, but that did not work at all. (Maybe I need a BILLET
flasher) Any ideas?

Glenn Wior
70 E
<<<<<<<<<<<

Search the archives & forums - http://search.jag-lovers.org/
Subscription changes - http://www.jag-lovers.com/cgi-bin/majordomo
Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.phpFrom: “melloyello” wior@msn.com
Subject: [E-Type] Switched to LED rear lights on series 2, indicator fizzles.