I have a 2015 Mack Pinnacle CXU613 and I’m having an issue with the left turn signal. The headlights aren’t on the light switch is turned to off, I go to use the left turn signal and all the chicken lights on the left side of the trailer come on flashing in sync with the turn signal. I go to turn the headlights to daytime & the on position and the left turn signal stops working. The turn signal on the dash becomes solid. I’ve unplugged the power cable from the truck to the trailer and the left turn signal works perfectly fine as it should. Plug it back in and the problem occurs. I thought it could have been that power cord so I bought a new one, same problem. The right turn signal works perfectly fine. Any suggestions on where to start looking for a solution? Thanks
Turn Signal Issue
Discussion in 'Ask An Owner Operator' started by blanusatransport, Feb 11, 2025.
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Check the prongs on the trailer. And like already mentioned, could be a ground issue on the trailer. Wiggle the light cord at the end. I bought this tool that has help for electrical issues to get you by.
blanusatransport Thanks this. -
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Probably something like this going on in that trailer
IH Truck Guy, blanusatransport and Diesel Dave Thank this. -
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