1999 Chevy S-10 High Mount Brake Light

You're going to have to be a little more specific. What and where is the stop light switch? Is that the brake switch under the dash? I have already checked the fuses under the hood and checked the bulbs. Where is the white wire to be found? I took the dome light off and looked at the wires behind the high mount box and I only saw a black and light beige wire there.

I disconnected the rear view mirror light months ago and the wires are just hanging down but my dome light works. Could this have anything to do with it?

I checked the wires at the light and got no connectivity with the brake depressed, but I got 8.8 volts. Not enough to activate the lights. Is is possible to get a "no complete circuit" reading but still read some voltage like that? Possible short in the wires leading from the light to switch? If I understand correctly the white wire goes only from the fuse box to the brake switch and the lt blue wire goes from the switch to the light. And the black wire from the light is the ground. Is this right? All I did on the rear view mirror was disconnect it, but according to the diagram it appears the dome light and high mount light are on the same circuit. Is that right? Yes I have swapped the relay circuit with the horn and it did not solve the problem.

I can't read the diagram. It's too small. Besides, I don't have a trailer and have never tried to wire one up. I have checked the fuses and relays. All of them. My mulitmeter reads 20 on the relays so I guess it's good. I went to a local auto electric repair shop and asked the mechanic about the brake switch. He said if the brake lights work there's no way it could be the switch because the high mount is wired into the same place.

Keith1126@gmail. Com

I just figured out the problem! I was checking voltage at the light and could not get anything off the light terminals so I was placing my leads on the posts that come up out of the bottom of the box and got 12 volts. Surprise! Why wouldn't the light work? I placed the lead on the brass strip and leaned it against the metal post it was attached to and the lights came on. I realized there was a bad connection between the wire post and the strip so I took a punch and hammer and tapped it back down so it would make contact and my light works fine now. Thanks for your help though. I learned a lot about brake lights and wiring.

Keith