Hi everyone,
I have a problem with my headlights that I can't figure out! Hopefully, someone here is an electrical guru and can help!
This issue is the headlights won't turn on...
I can see that the HI and LO gets 12v when the bulbs are plugged in (from the H4 socket).
When there are no bulbs plugged in only the LO gets power (when LO is ON) and HI (when HI is ON). But as soon as I plug in one bulb in either side of the harness, the other side plug will flow 12v on both HI/LO connectors.
I tried troubleshooting with a multimeter, on the dimmer switch side it is ok (the switch command the right thing). Past the relays that is where the problem occur... only when a bulb is plugged in. If no bulb is in then HI is dead when LO is ON and vice-versa.
This is in a 51 3100. All the wiring harness and switches is brand new from Speedway, along with the HD headlight kit from LMC truck.
So I have my Hi and Lo wires hooked up to the HD harness with the relays.
I have taken apart the HD harness and routed everything, it looks like this:
The light actually worked a few times (1 out of 10) and HI/LO selection doesn't seem to change anything.
I tried switching bulbs (my bulbs are brand new 9003/H4 Syvania Silverstar) and the old sealed 7". Same story!
Anyone have some ideas?