I want to add relays to the headlight wiring on my 99 Dodge 3500. Can anyone tell me when they went from switched power to switched ground? When I checked power at the headlight harness plug I had 11-12V at pins
A-VT/RD & C-RD/OR on low beam and A-VT/RD & B-VT/WT on high beam. Should it be showing voltage at two of the pins on both low & high beams?
Thanks
Rick.