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Unread 04-21-2014, 09:55 PM   #1
mlm85
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2001 TJ Wrangler 
 
Join Date: Apr 2014
Location: stratton, Maine
Posts: 5
weird guage wiring question

ok so i just posted my first post and i figures while i was here,
id go for my second.

so a few months ago a guage light went out.
i removed the guages to replace the light and found something the previous owner had done.
from the center bulb on the circuit board guage assemble there is a wire that has been stuck between the bulb housing and circuit board. (this was not the bulb that was out)
the wire goes to the black and yellow wire in the harness. it has been spliced into it.
i replaced the bulb and left the wire alone as i did not know what it did and why mess with it.

but now curiousity has got me.....

any ideas guys?

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Unread 04-21-2014, 10:07 PM   #2
geroux
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2004 TJ Wrangler 
 
Join Date: Nov 2013
Location: San Antonio, TX
Posts: 338
Without knowing exactly what that yellow/black wire it's hard to tell.
My first guess is, power or ground was not getting to that particular bulb due to maybe a bad trace in the circuit board or something. So he jumpered it with a wire to power or ground (whatever the yellow/black wire is).
Pull the wire out. Maybe the bulb won't work without the jumper wire.
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Unread 04-22-2014, 03:05 PM   #3
Jonny Jeep
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1997 TJ Wrangler 
 
Join Date: Feb 2007
Location: Manchester, UK
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In later TJs where the lighting controls are on the indicator stalk the cluster controls the dimmable dash/cluster illumination bulbs. In earlier TJs they are directly controlled by the switch.

Occasionally the driver circuit in the cluster fails which leaves people with no dash illumination. As a work around I have suggested in the past that the marker light circuit (black/yellow wire) be tapped to the dash illumination circuit (orange wire) to allow the dash illumination to run at full brightness with no dimming possible.

It seems the PO of your TJ has figured that on their own and used a jumper wire to solve the problem. If you turn the dimmer on your multifunction switch I believe you will find the lamps do not dim, and that if you remove that wire you will not have any dash illumination. If you want to tidy it up you could tap that wire into the orange wire at pin 6 of the C2 cluster connector. The black/yellow wire should be at pin 4 of the C1 cluster connector.
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Unread 04-22-2014, 06:12 PM   #4
mlm85
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2001 TJ Wrangler 
 
Join Date: Apr 2014
Location: stratton, Maine
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yes the dimmer switch does not work.

thank you, ive been putting it off as a problem with the dimmer switch which i planned to replace eventually.

now i know.
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