[cntgtright]

I have a chevy 3500 unicell box truck that I can't get the rear running marker lights to work. Brake lights and turn signals work fine. Where is the problem ?

[TxGreaseMonkey]

. Check all under dash and under hood fuses with a test light or multimeter.

. Check bulbs.

. Check switch continuity.

. Check for power along the circuit, which may indicate a break in the wiring.

. Check/clean grounds.