If I press on the high beam floor switch in my 51 one headlight beam goes to high, the other side goes to low. Do I just reverse wires on one light or is it more complicated? Thanks!
There is probably a connector where the headlight harness connects to the main harness ---just reverse the 2 wires in their connectors on the light that is wrong.
Like Kurt says. Look for the junction blocks next to the radiator on either side. Trace the wires from the headlight harness that cross over and swap their connectors.