Question about 2003 Pontiac Montana

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Rear tail light problem

I am trying to trace the cause of my driver's side tail light assembly problem. The symptoms are: The left signal will go from normal to hyper speed on occaision, the left signal light has gone out, there is evidence of the rear light assembly is pulling too much electric through only one wire. I have replaced the plug to the assembly and I have replaced the assembly. both gave temporary fix but then returned to being a problem. Suggestion was given that perhaps the wire is grounding improperly, or not grounded properly. How can I trace the wiring and find the issue without paying $100 an hour for a dealer service pro?

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Rear lights is not working

Posted on Oct 31, 2012

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There is a problem with the socket board your lights are in. Pull out the connector and check for signs of melted plastic around one of the connector pins. If yes, replace the connector and the board. I had same problems and replacing it fixed it. There are other posts about it on the web.

In the diagram in the link below it's item numbers 4 and 5.

http://www.trademotion.com/partlocator/index.cfm?action=getJointLocator&siteid=214638&chapter=&Sectionids=0,2827&groupid=2828&subgroupid=2829&componentid=0&make=28&model=Montana&year=2002&graphicID=FN97500&callout=1&catalogid=2&displayCatalogid=0

Posted on Aug 15, 2008

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It's doubtful that the wiring gauge is too small for the current drawn.

What is more likely is that one of the bulbs is either open or a socket has oxidized, losing contact.

The rapid flashing symptom is pretty common when a bulb loses its filament or the socket is corroded.
The flash rate is controlled by the load on the flasher.
This arrangement lets you know when a bulb has failed as the flasher does not heat adequately before interrupting making the flash rate rapid.

The same effect can occur if a ground is poor on a particular lighting assembly so you will need to locate where and how the ground side is handled.
Often it is via part of the metallic mounting and if you do not find a dedicated ground wire, lossen and tighten any bolts or screws you can locate around the lamp housing.

I don't think you need a service tech, just some time and close attention.

Posted on Jun 29, 2008

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Posted on Jan 02, 2017

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