2000 blazer ls loaded, 4wd, 136,000 miles.
While troubleshooting the inoperative lights on my new boat trailer, I discovered that I'm only getting 5 or 6 volts at the brown wire on my harness plug. Voltage on the yellow and brown doesnt have enough time to get to 12 before the relay kicks off, so I've no way to see if they get that high. i removed the harness, which had a fair amount of corrosion, and tested the "good" wire 2' up the harness, and the voltage is still low.

Of note:I have not yet run a separate ground up to the battery to rule out a faulty ground circuit on my massive white wire in the harness bundle, but I will do so tomorrow. ALL FUSES ARE GOOD. I have NOT checked voltage on the "out" side of the fuses, however.

Just looking to see if anyone has encountered this, or has any quick ideas. I will do the above mentioned things tomorrow and see if my results improve.

Thanks, all!

 

i would guess ground. especially if all 3 wires arent giving a good signal. just run a long piece of wire from your battery and connect it to the ground and see if that fixes anything

 

Ok. Voltage tester battery was dead, giving me faulty readings. My voltage at the plug is fine, but when I plug it into the trailer, nada! NO continuity between green, brown, or yellow and the ground. Continuity between the trailor and the ground wire at plug (meaning the groundwire is properly grounded to frame, and trailer is selfgrounding to ball, I think) this is a tough one! Ill see what im getting for voltage at the various lights tomorrow, see if I can't figure anything out. I just want some damn trailer lights!

 

bad connector on the trailer? if its working on the truck and not on the trailer. its something on the trailer side of course lol. check the ground on the trailer. my car trailer, i swear i have to remove clean and rescrew it down like every other year if not more.

 

sounds like a ground! or the wires are pinched under the tonuge.