u/Aggravating-Snow2698

Anyone have any advice on where to start on this one? I know where the EGR is? Start checking the wires going to EGR Position SENSOR?

Someone please help. I own a power probe 4. There are functioning rear flood lights on rear of truck that turn off with a switch on the dash labeled “Rear Flood”. These two lights on back of cab have ground from the connector in the loom and like 0.34 volts on the power side on ignition. If I go to the connector on the end of the light and send 12 volts. I can turn on this closest light to me and that’s it. Any opinions? All fuses checked out. Wish I had a relay buddy to test relays faster