Question about 1998 GMC Sierra

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1998gmc tail lights don't work fues is good bulbs are good

Cheked the trailer conection

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There is a Relay for these in the Fuse Box under the Hood. Replace that Relay and you should be Good.

Posted on Jan 23, 2009

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The left tail light on my trailer doesnt work.the stop and turn signal works . is there a fuse for it? i have 2011 gmc sierra 1500


There is a tail lights fuse for the truck, but not for the trailer.
First, check that your left tail light on the truck is working, if not fix the problem (new bulb, bad contact, fuse).
Then the obvious suggestions regarding the trailer are: Check the tail light portion of the bulb to be sure it is not blown. If good (best to put in new one to be sure), then check the wiring from the front of the trailer all of the way to the non working bulb, including every connection and at any place it is secured to the trailer frame. If all is good with the trailer circuit and bulb, then check the truck's trailer connector, including any adapters. If by chance the truck is wired with a flat 4 wire harness the problem may be solved (but usually the blinkers are the problem). Modern trucks require a 5 wire harness which self adapts to the standard 4 wire trailer circuit. Check for dc power (12 volts) from the truck's female connector. One wire will be ground, others will be taillights (turn on headlights), brake lights (have someone press brake pedal), and blinkers (turn on switch and blinkers).

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1 Answer

No running lights on back of car


park-tail-running.
all others good there are huge number of park lamps on car
on front, sides,, on dash and tail.
if only the rear are out , did you check the bulbs and for trailer wiring hacks behind the lamps.
and all fues
and look for tail relay near the fuses. in box?

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1 Answer

I have a 05 silverado all three break lights do not work. When I hook up my boat the break lights on my trailer function just fine. And all bulbs and fuses are good any ideas.


Have you checked the bulbs? Some people don't beleive all the lights can burn out at once but when one brake light is on they are all on and for the same amount of time.
If the bulbs are fine then check the connection where the trailer plug is to the main harness. Some of those connectors go between the main harness and the tail lights and the connector can go bad.

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1 Answer

My tail lights don't work but my turn signals and brake lights work. when i hook up to my trailer and turn the lights on all the trailer lights work but still no truck tail lights


the tail lights are the same bulb but they use a different filament in the bulb.you may need to replace the bulbs.another possibility is there maybe a problem with the wiring for the tail lights between the socket and the area where the trailer wiring is connected to the truck wiring.try the bulbs first,you just have to try one first to see it it works or not then you will know what to do next.

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try http://www.etrailer.com/faq-wiring.aspx. They have very good concise information that might help.
Take it back and have them check the wiring. It sounds like the converter is wired wrong or faulty.

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1 Answer

Lighting problem


Have you checked the fuses and dimmer switch? Check the trailers bulbs there is usually one bulb with two filaments for each light, one filament can burn out without causing the other to go. If the bulbs are good you should start at the trailer light connector ( use a test light or voltmeter to test for power at the trucks wire harness first to see if it's the truck or the trailer ) and work your way back to the lights. Clean the contacts on the connector, bulbs and bulb sockets (steel wool and or a can of aerosol electrical contact cleaner).

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2 Answers

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Some times when you get a short circuit. It will burn out a tail light bulb. With the bulb burnt out you don’ have a complete circuit. First, replace you tail light bulbs. If that doesn’t work. Check to see if you have a ground wire come off.

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