Then I have no explanation.
A single power wire comes out of the dimmer switch and then branches off to the left and the right.
There isn't anywhere for the power to be swapped back and forth.
Unless you have owned the van since it was new, I'm speculating that someone (possibly a highway construction worker) may have installed a flasher system.
I only have 2 suggestions for you.
1 with the engine off, and the lights on, watch for the lights to start flashing and listen for any clicking relays.
Also unplug one of the lights and see if the other side continues to go on and off.
2 start physically tracking the power wire with a test light.
Tuesday, February 23rd, 2010 AT 10:44 PM