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Go to parts dept at dealer, if they don't carry it find an electronics store like Digi-key or Allied on-line, they probably carry Omron relays or can order it.
There is a relay box under the hood. I can't remember if the light relay is in there but the one for the AC is in there for sure. You can use an OMRON for a chevy to replace most of the relays in this box. Also if your AC is not working correctly, do not bother replacing the fan relay, the motor cooling fan is defective and intermittent.
Hi There are a couple of wiring diagram and manual available on the net. The relay you are talking about is the park lamp relay which supplies power to the tail lamps, license plate lights and both front and rear park lamps. If the park and plate lights are working the light switch, relay and supply power are good. You need to verify for a broken brown wire to the tail lamps (assuming the sockets, lamps and grounds on both tail lights are good) .If none of the lamps are working then the 15A fuse number 3, the light switch or the park lamp relay could be bad (note different contact in the main light switch work the other lights)
Definitely Electrical.
Check the fuses.
On the bottom (or top) of the fuse box cover there's usual a diagram listing what each fuse is for. Check the ones pertaining to the systems affected.
Also, the diagram will list the relays. Find the relays that pertain to the affected systems and quite often you will be able to take a relay from a known working system in the car and swap it (with one of the same number of course) to see if the problem follows the relay.
Don't forget, there's usually two separate fuse/relay boxes, one under the hood and one under the dash.
Also, check your electrical system's Ground connections for good contact.
Start with the battery ground connection and go from there.
There's several, so this will take some time to do.
Let us know what you come up with, or if you need more information.
check your wiring on the side tat the light dont work with a light tester whith the switch on
your wiring might be broke or you light holder might be no good
Check under the dash or on the sides of the dash with doors open, or under the hood in a box marked fuse relay. In most GM cars and trucks these are the places where thay stash the fuses
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