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Car Forum / Jeep / July 2003

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Brake light problem on JGC

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alaskanative - 31 Jul 2003 16:12 GMT
The left rear brake light on a friends Grand Cherokee is acting
up.  When the lights are off, it works normally.  But if the parking
or headlights are on, the brake light is not on at all or only very
dimly.

We have checked and replaced the bulb, and cleaned the contacts, to no
avail.  We have even replaced the passenger side bulb just to be sure.

Anyone have any thoughts?

I did a google search and this question has been asked MANY times, but
never an answer.  Did any of you ever get this problem fixed?
Earle Horton - 31 Jul 2003 16:08 GMT
Bad ground at the light fixture.

Earle

> The left rear brake light on a friends Grand Cherokee is acting
> up.  When the lights are off, it works normally.  But if the parking
[quoted text clipped - 8 lines]
> I did a google search and this question has been asked MANY times, but
> never an answer.  Did any of you ever get this problem fixed?
Jeff Strickland - 31 Jul 2003 16:57 GMT
I concur.

When the running lights are off, the brake light filiment is getting a
ground through the running light circuit, when the lights are on, the ground
source isn't there and the brake light does not come on.

> Bad ground at the light fixture.
>
[quoted text clipped - 12 lines]
> > I did a google search and this question has been asked MANY times, but
> > never an answer.  Did any of you ever get this problem fixed?
Charles Perry - 31 Jul 2003 17:12 GMT
> I concur.
>
> When the running lights are off, the brake light filiment is getting a
> ground through the running light circuit, when the lights are on, the ground
> source isn't there and the brake light does not come on.

I know someone with the same problem.  where is this ground?  If I remember
correctly, the housing is held in by two screws, but they run through a
plastic tab on the light fixture, no metal.

Charles
Jeff Strickland - 31 Jul 2003 19:46 GMT
I don't know the exact structure of the lamps, but the description of the
problem is classic loss of ground.

> > I concur.
> >
[quoted text clipped - 8 lines]
>
> Charles
DougW - 01 Aug 2003 00:13 GMT
> The left rear brake light on a friends Grand Cherokee is acting
> up.  When the lights are off, it works normally.  But if the parking
[quoted text clipped - 8 lines]
> I did a google search and this question has been asked MANY times, but
> never an answer.  Did any of you ever get this problem fixed?

bad/rusty 6pin connector to the tail lamps.

http://members.cox.net/wilsond/Fixes/rearlampfailure.html

(some day I will do a better page than that...)
 
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