Low Beam Relay Not Functioning

[DesertCat]

Originally Posted by VetteVet

Swap the two relay wires at 85 and if the highs light and the lows don't then you have a bad relay., or the power from the relay at 87 is not getting to the low beams.
This test will also verify that the dimmer is Ok because it means that both wires off the dimmer are getting voltage to both relays.

If the situation reverses then it means that the dimmer switch or wire on the low beam side is not getting power out to the relay.

You can check for power at 87 and tell if the relays are working as well,

Sorry VetteVet, but that is confusing it... if as he states, all 4 bulbs light when the dimmer is switched to high beam, it simply cannot be anything but the dimmer.

If that is not the case, and the low beams never come on regardless of switch position/condition, then you would be correct. It would be far easier and quicker to swap relays though... if the problem reverses then it is a bad relay, if not then check for main power at relay (30), switch power (85) then if those check out, make sure you have continuity from output (87) to the light sockets. Finally, don't forget the relay and bulbs also need a good ground, so check (86) and the bulb sockets are grounded.

The OP needs to clarify what exactly he means by "which in turn means all 4 of my lights are on" Does that mean all 4 light truly do come on, or merely should come on?