2003 Oldsmobile Silhouette brake lights

2003 OLDSMOBILE SILHOUETTE
75,000 MILES • AUTOMATIC
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GRANNYLAKE
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top brake light, blinkers, taillights, work; fuses and bulbs good; lower brake lights DO NOT work; van does have a connection to attach lights of a trailer and trailers lights work.

How do I follow brake light line to find out where it is disconnected? What if line is severed?
Jul 30, 2015 at 7:46 AM
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HMAC300
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check to see if there is power going into multi function switch that my be the problem. if power comes out the lt blu and yellow wires then have it scanned for codes by a pro because it may be the drl module or body module bad.
Jul 30, 2015 at 8:15 AM
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GRANNYLAKE
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Thanks. I'll have someone check that.
I should add that recently I had a trailer hitch put on. I've used it with a trailer several times with no problems.
Then, a trailer was not properly attached and it came off while pulling the trailer.
It was reattached, the trailer lights worked fine but I don't know if the car's brake lights were affected at that time.
It was after that incident that the van's brake lights were not working.
I was thinking about having the guys that put the hitch on see if they can tell what wire is loose.
Jul 31, 2015 at 2:23 AM
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HMAC300
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have a mechanic do it not the trailer guys they put the cheap connectors on an dthey cause a lot of problem.s
Jul 31, 2015 at 6:26 AM
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GRANNYLAKE
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Thank you for the heads up on the trailer guys. That's nice to know.
Jul 31, 2015 at 2:27 PM