Lost the brake lights the other day. They work on the tractor but not the trailer, same on multiple trailers so in the truck; but that's as far as I got. Are the trailer brake lights going to be on a separate circuit?
It's a 99 T600, guess I'll have to start at the trailer connector and work from there. Just a shot in the dark to see if someone can point me where to start looking. Can't see anything obvious in the wiring, but it has been messed with right in front of the 7 pin connector with some splices; so that is a little suspect.
Kenworth T600 trailer brake light issue
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by caribou8820, May 23, 2020.
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First thing to do is check the fuse. Any short in any trailer you've hooked to could have popped it.
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Found the problem, Wire was broke going to alternator, so was not powering trailer relays.
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I've been wrong before but I've been turning wrenches for over a decade and that doesn't sound right. I think it may have been a coincidence. If it is, good chance the problem is somewhere near the area you found the broken alternator wire.
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Hook back up trailer and tractor. I traced the wire, it goes up to the back of the engine, front of the firewall; brings power to the trailer brake relays and I don't know what else, seems like that is the main purpose of it. It looks original; not added on or anything. -
Ok perhaps that's where KW decided to take the 12 volt power feed for the T600 then. Never seen that before.
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