[Bill Hanlon]

Thanks John.

Plan A (above) is a no go.

Plan B (shown below) depends on a non-existent reed relay.

The power wire (yellow on my diagram) going from the wiper fuse to the wiper motor is cut open and the reed relay coil is inserted into the yellow wire. The high current through the reed relay coil (just a few turns of #14 wire) when the wipers are on will generate a magnetic field which will pull in the contact of the reed switch. That will cause the cube relay to pull in, switching 12V to the dimmer switch and turning on the headlights.

The hard part is no one seems to make a reed relay with a coil capable of passing the high amount of current the wiper motor needs to run. I just ordered three 2" long reed switches. I'll wind my own coil around one of them. and do some testing using the 2 speed electric wipers in my old truck.

Comments about this working or not would be appreciated.