Reply to thread

For what it's worth, allow me to clarify:

The light bar is connected to an upfitter switch, which has a relay somewhere, yes ?

According to FTO, a solid state relay would be the safest method of tapping into the high beam circuit.

So if wiring a second power supply to the light bar in that way:

Is a diode or something necessary on either power wire to prevent backfeeding the other circuit ?

Whew, thanks !