Originally Posted by markwb
The DRL relay when dropped out, switches ground in for the left high beam to provide normal high beam operation. (high beams paralleled) When the DRL relay picks up, it switches in 12v+ to the left high beam & places both left & right high beams in series for DRL operation.
That is the thing though, I have noticed when following black trucks and vans that it does not use the high beams for DRL it uses the standard lights, I tested this also by flashing my brights the standard lights turn off the high beams turn on.
Am I to assume I don't have 12v running to my high beams then?