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Here is the wiring diagram for the headlights. One is w/DRL and one without/DRL.
I sent you both. Start with checking for voltage at the headlamp connector and the start working back on the diagram.
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Ignore the bottom diagram
Yes check at the connector at the bulb, you need 12 volts, also check that ground, the G100 there is a body ground near the head lamps, just follow the harness.
If you have 12 volts and they dont work, then bad ground, if no voltage, then we work backwards from the headlamp bulbs
OK, sounds good.
Unlikely to show a higher voltage.
If battery is fully charged it might be a little higher like 12.6. Which is normal.
what is your battery voltage? measure at the battery posts
Check voltage at the multifunction switch, then check the head lamp switch. use the wiring diagram I sent you for wire colors.
Check the ground as well from the headlamp bulb connector.
No that is not the problem. they are all halogen. I would double check that both low beam bulbs work by hooking them straight up to that battery with some wire. You said the headlamp connectors were a little corroded, that could be causing the problem. Corrosion will reduce voltage because it is extra resistance.
Replacing it would be the best. Unless you can repair with new wires. Try grabbing the harness and wiggling it to see if you can make the lights turn on and off. That would help narrow it down.