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| Doug,
On my 1996 Chevy Silverado there is a wireing harness adapter that plugs in between the wireing harness going to the taillights on the truck.Then there is a harness that runs from the adapter with a male end that plugs into the female end at the trailer harness.Check to see if your harness from the truck is hard wired in at the tailights or comes from an adapter,if there is an adapter make sure the ground conection is clean from corosion.A week ground will give you a loss of power to trailer lights,the tailights on the trailer may be grounded at the trailer and that is why they work and the side markers do not.
Capt. Larry | |
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