Question about GMC Sonoma

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I'm trying to reconnect my headlights for my 92, and I don't know what wires are for what. I have High beams but no low beams, and relay is new. Two wires are not wired to anything, green and black on drivers side.

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  • GMC Master
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You have three wires on a headlight bulb the top one is earth and the ones either side are for dip and beam ,cant remember which way round they go though and its dark outside so iam not going outside to look now as just had a shower .

Posted on Nov 12, 2010

  • lil_midget_k Nov 12, 2010

    both headlights are connected and I get high beams, but no low beams, the relay is new. On the drivers side light there are two wires not connected(a solid dark green and a black) I don't know if it has to do with me not having low beams or not.

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Where can i find the headlight relay


This one is pretty easy to conceptualize if you understand how a relay works - and if can't then you should go read my All About Relays page so you can. You splice two 20A relays into the existing wiring harness right out near the headlights so one relay controls the low beams and one controls the high beams. Use the existing high and low beam wires coming from the firewall to trigger the relay, run a new high power feed (with a fuse!) direct from the battery, and hookup the existing high and low beam wires from the headlights to the "normally open" contact on the relays. The hardest part of all this is typically finding the right wires in the existing wiring harness and finding a place to mount the relays - the actual wiring is pretty easy. Any SPST/normally open relay will do, though most automotive relays are of the SPDT variety - just don't hook anything up to the "normally closed" contact on the relay (pretend it's not there) and you'll be fine.
Note that if you pick some really monster sized off-road headlights that draw more power than the ones that you can plausibly use "on the street", you must use higher amperage relays than what is mentioned here. You must also use the appropriate sized power wires and you may very well end up replacing all of the headlight wiring from the relays out to the headlights themselves

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1 Answer

I have a 95 SC2. The high beam headlight on the passanger side does not work. Both low beams work, and when the high beams are turned on, the right side goes out completley. I tried a new light and then...


According to the wiring diagram, there is no relay involved.
The headlight switch provides the ground for the lights and they get power from a fuse for each side. So the high and low beam on one side is powered by the same fuse and the ground is thru the switch.
Could be the switch but chances are a wiring problem.

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1 Answer

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on that year i did not find one either when i rsearched it . so i"am going to say that headlight switch and relay all in one . . but if you have a enigine type fuse box check it anyway or goto headlight swtich and follow the wiring down a bit and see if there is anything connected to it .

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1 Answer

My headlight low-beams don't work, yet the


I had a similar issue with a 92 Saturn SL1, were the problem wasn't anything easy. It ended up being that the wiring was so old and worn out (Somehow) that I ended up just buying the replacement light sockets with the wire leads and rebuilt the headlights to run off from toggle switches mounted on the dashboard.

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It sounds like you are confused about how your headlamp system is supposed to work. The DRL does not run on the High beam circuit, it runs on the low beam circuit. The fog lamps are supposed operate with the park lamps and also with the low beams, not the high beams. From your description, I would say that your system is operating as designed and you are having trouble telling High from Low. (Don't feel bad, that is why high beam indicators were invented in the first place.)

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1 Answer

I have a 2005 dodge caravan. the headlights have


On the van you have a high beam fuse and relay. On the low beam you also have a fuse and relay. Check the fuse/relay panel for a blown fuse controlling the low beam lights. If you do not find a blown fuse have some one to turn the key on and turn on the high beam lights> During this time locate the low beam headlight relay and place your finger on top of relay, have the other person to switch from high beam to low beam lights. You should feel a click in the relay when they make the switch from high to low beam. If not replace the relay and the problem should go away. Hope this will help you.

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