1994 Mercury Tracer Backup and license plate lights not wor

RICKHUE

MEMBER
1994 MERCURY TRACER
4 CYL
FWD
AUTOMATIC
106,000 MILES

I am trying trouble shoot this issue and so far I have no 12 v or ground to either. The wires are on the same plugs in the trunk. Can someone tell me if the wires have another plug somewhere up the line and if so where? Chiltons diagram show license plate and park lights coming from the same source and park lights all work. The third tail light is not working either but I have not had a chance to even look at it.

Wednesday, June 10th, 2009 AT 11:04 AM

3 Replies

DOCFIXIT

MECHANIC
18,828 POSTS

Hi
The plate backup and high mount brake lights all share the same ground. Check the black wires to ground with OHM meter. Follow wire back to right side trunk junction. Somewhere the ground is being lost.
Hope this helps
Thanks for donate

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Wednesday, June 10th, 2009 AT 11:19 AM

RICKHUE

MEMBER
5 POSTS

I know I don't have a ground, but I don't have 12 V going to the ground on the rear parking light on any of them either?

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Wednesday, June 10th, 2009 AT 11:31 AM

RICKHUE

MEMBER
5 POSTS

I know I don't have a ground, but I don't have 12 V going to the ground on the rear parking light on any of them either?[/Quote:13b2e22644]

No they don't all share a common ground in fact the ground to the backup light and the plate is shared, but it's only shared between the sides they are on (right side has one ground, left side has seperate ground) the high mount brake light is seperate. What is happening (I've seen other forums where this question is asked and did not see an answer of what was wrong) these wires are affixed to the arm that raises and lowers the trunk lid, over time of going up and down the wires break, in my case both grounds and the 12v to the plate light, the high mount brake was the bulb.

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Thursday, June 11th, 2009 AT 6:48 AM