Rick's Free Auto Repair Advice

Turn Signal Problems — GMC/Chevrolet Trucks

Fix Turn Signal Problems — GMC/Chevrolet Trucks

Some shops have been reporting repeat Turn Signal Problems with the factory trailer adapter on GM trucks. The symptoms show up as all turn signal lights flashing when you turn left or right and constant power at the trailer harness. The adapter may also cause all ot
her kinds of Turn Signal Problems. At first glance you may think to replace the turn signal switch assembly, but check the trailer adapter first. The adapter is located down by the spare tire and is either a black or aluminum colored box.

Start by checking the wiring connections. If they are good, unplug the connector to the adapter. If the problem disappears, replace the box. The Turn Signal Problems are most likely a shorted diode inside the adapter.


© 2012 Rick Muscoplat

Posted on by Rick Muscoplat

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