park lights work but my head/hb lights wont come on..changed the dimmer switch same problem..what else can be causing this to happen?

 

Welcome to TGO. A search will often turn up in the info you need. The following may be helpful:

Headlights
Circuit Operation:

Voltage is applied to the light switch at all times. The light switch includes a self-resetting circuit breaker which opens and closes if the headlight circuit draws too much current. When the light switch is in "Head," the headlight dimmer switch directs current to either the lo beams or the hi beams. Current to the hi beams also flows to the high beam indicator.

Troubleshooting Hints:

If only one headlight doesn't work in both "hi" and "lo", check the ground wiring.

If headlights don't work in just "hi" or just "lo", check headlight dimmer switch.

If headlights flash on and off with switch in "head," isolate short to ground. Operate the headlight dimmer switch to find if the short to ground is in tan or lt grn wires.

If only the "hi'" headlights flash on and off, check lt grn wires for shorts to ground.

If only the "lo" headlights flash on and off, check tan wires for shorts to ground.

If both "hi" and "lo" headlights flash on and off, check the yel wire for a short to ground.

BTW, did you adjust the dimmer switch?

JamesC