Quote:
Originally Posted by RustyPile
We need more information to give detailed trouble shooting procedures. Be that as it may, here is a basic headlight circuit description.. Most models don't have factory installed headlight relays.. Fuses aren't used either... The headlight switch has a built-in circuit breaker.. Over the years, the breaker weakens, and trips for no reason and the only repair is switch replacement..
Power is fed to the switch, one wire goes from the switch to the dimmer switch common terminal.. Power leaves the dimmer switch through 2 wires.. Depending on the beams (hi or lo) selected by the dimmer switch, power is routed to the headlight bulbs. The two wires from the dimmer switch split near the back of the radiator support and go to each headlight.
Using a volt meter or test light, start at the headlight switch and follow the power path through the connections, checking for loose and or bad connections including grounds.. If you have power to the headlight switch but nothing coming out, check the plug connections first.. It's not uncommon for loose connections to develop, causing heat to develop on these connections causing plug failure. If all is well at the plug, the switch is probably bad..
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The OP description of the problem leaves a bit to be desired.
I can only assume the HI beams light but the Low beams do not... That is probably incorrect but my crystal ball is on the fritz.
The headlamps have a fusible link in the feedline not a fuse... usually at the starter BAT terminal. It can differ by model year. There's no mention of the model year or other pertinent information. Again I find my crystal ball insufficient to the task.
I can't recall a circuit breaker in the headlamp switch itself.
If the parking lamps light up there is power to the switch.
The dimmer is a single pole double throw switch. It has three connections. Power in from the headlamp switch, Low beam out, and HI beam out.
If the HI beams light and the Low beams do not, as his verbiage seems to imply, then the dimmer or the dimmer plug is suspect.