Have been having occasional brake controller issues:
Usually just "Check trailer wiring" and then it goes away.
Rarely "Trailer brakes disconnected" and then it returns after a while.
No rhyme or reason that I can see.
Prolly the trailer wiring somewhere, but just to be sure I thought I'd test the truck's circuit by running it without the trailer but with a resistor across the brake leads to simulate a trailer.
Measured a couple of brake drums and got 3-4 ohms across each, so figured about 1 ohm total for all four wired in parallel. Tried that with a big wire wound 1 ohm ceramic resistor but got the "Check trailer wiring", immediately. Same with two ohms.
Think somebody here suggested a 10 ohm resistor but I don't have one and that doesn't match what I measured anyway.
Any suggestions? Anybody know how the brake controller senses the brakes?
I'll be going over the trailer wiring anyway, have already replaced the plug, but thought it would be nice to definitely eliminate the truck first.
Usually just "Check trailer wiring" and then it goes away.
Rarely "Trailer brakes disconnected" and then it returns after a while.
No rhyme or reason that I can see.
Prolly the trailer wiring somewhere, but just to be sure I thought I'd test the truck's circuit by running it without the trailer but with a resistor across the brake leads to simulate a trailer.
Measured a couple of brake drums and got 3-4 ohms across each, so figured about 1 ohm total for all four wired in parallel. Tried that with a big wire wound 1 ohm ceramic resistor but got the "Check trailer wiring", immediately. Same with two ohms.
Think somebody here suggested a 10 ohm resistor but I don't have one and that doesn't match what I measured anyway.
Any suggestions? Anybody know how the brake controller senses the brakes?
I'll be going over the trailer wiring anyway, have already replaced the plug, but thought it would be nice to definitely eliminate the truck first.