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11-17-2007, 09:49 AM
| #1 |
| Junior Member Join Date: Nov 2007
Posts: 2
 | electrical problems I have a 85 GMC 3/4 ton the problem I'm having is the rear tail lights one minute they will work and the next minute they don't nothing at all but if I shake the back of the truck they will come on and if I keep doin it they will flicker i don't know were to start .  |
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11-17-2007, 03:39 PM
| #2 |
| Senior Member  Join Date: May 2006 Location: Bay City,Michigan
Posts: 383
| follow the wires from the lights to the front.. I bet they're shorting out on the box or frame. shouldn't be a hard fix
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11-17-2007, 04:34 PM
| #3 |
| Senior Member  Join Date: Jan 2006 Location: South Florida (Palm Beach), originally from south of BOSTON
Posts: 644
| i bet its just a loose or corroded connector behind the light assembly, pull it off clean it and put it back on, it should would. if it were a short, it would be blowing a fuse, so i bet it is a loose connector
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11-18-2007, 08:50 AM
| #4 |
| Senior Moderator  Join Date: Feb 2006 Location: michigan
Posts: 6,375
 | actually, if the short were after the load (tail light), i believe the lights would still work and not blow a fuse. before the load would be a different story.
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11-19-2007, 05:55 PM
| #5 |
| Senior Member  Join Date: Jul 2007 Location: on your 9
Posts: 3,366
| Welcome to the forum robert d. Think you might have read that wrong. Fuse idea was related to before the lamp, so was right. Grounds going bad on a truck that age is common, so check connector as suggested but if both sides failing together is more likely the ground to frame at rear of truck. To be sure that is the problem if you don't see it right away, take off a lamp fixture but don't disconnect wires. Shake truck to get failure and while bad, use a jumper to a GOOD ground or check voltage to good ground. Be sure which side of lamp is failing. |
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