GM Repair Questions? Ask a Mechanic for Answers ASAP
Hello, I'm Cam. Please include all the details about your issue so I can accurately advise you. I cannot see your vehicle so please be detailed.
Confirm this is only on the trailer, correct?
meaning the truck signal lights and brake lights are good?
yes they are working properly on the truck with the trailer connected and unconnected.
OK they are seperate. So, on the plug, is there a proper left and right signal with the signals on?
the truck signals and brakes are independant of the trailer and the brake/signal is a single wire for each side on the trailer.
when checking on the truck side of the connection, the left side terminal has no power when the brakes are applied, when the turn signal for the left side is on, there is only power on the left side, when you turn on the right side turn signal, you get power on both the left tern\minal and right terminal.
Now the signal flasher which also controls/splits the brake and turns for the trailer is notorious for failing, but we need to make sure it is not wiring.
same for brakes then?
And right signal only does right side on the trailer not both?
the right turn signal also does both on the trailer. what it does at the truck connection also does on the trailer
Ok so try this, remove the TRLR RT fuse in the left dash fuse block, what happens?
ok will go out and do
when i pulled the trailer dash fuse, the right trailer light quit, but the left trailer light is still flashing.
ok, so that means the wires are not crossed and means it is the flasher on the back side of that fuse block
okay so i will need to replace that flasher control
i am not use to this type of flasher.
yes, replace it.
thanks for your help.
This is a long black big relay and you need to remove the dash trim under the column to get at it
okay. anything else i will need to know to replace it
Nope, plug and play unit.
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