I'd make sure that you have battery voltage on yellow wire of headlight switch when you turn lights on. The yellow wire goes to dimmer switch. Make sure you have battery voltage at dimmer switch.
Then click dimmer switch and see if you have battery voltage on either the light green or tan wire coming from dimmer switch. Your testing here to see if dimmer sw is outputting battery voltage to lights.
If you didn't get batt voltage on yellow wire @ headlight sw, the headlight sw is bad. If you got batt voltage from headlight sw and no voltage at dimmer sw. Then wiring to dimmer sw is bad.
If you got voltage into dimmer sw but not out of it on both low & high beam settings, then dimmer sw is bad.
If voltage good with both low & high beam of dimmer sw but headlights don't light, wiring or connectors to headlights bad.
My only question is, does 80 model use floor mounted dimmer switch or steering column mounted dimmer switch? If colum mounted sw, there's the possibility that steel rod that works dimmer sw is not working correctly or dimmer sw is out of adjustment.
Then click dimmer switch and see if you have battery voltage on either the light green or tan wire coming from dimmer switch. Your testing here to see if dimmer sw is outputting battery voltage to lights.
If you didn't get batt voltage on yellow wire @ headlight sw, the headlight sw is bad. If you got batt voltage from headlight sw and no voltage at dimmer sw. Then wiring to dimmer sw is bad.
If you got voltage into dimmer sw but not out of it on both low & high beam settings, then dimmer sw is bad.
If voltage good with both low & high beam of dimmer sw but headlights don't light, wiring or connectors to headlights bad.
My only question is, does 80 model use floor mounted dimmer switch or steering column mounted dimmer switch? If colum mounted sw, there's the possibility that steel rod that works dimmer sw is not working correctly or dimmer sw is out of adjustment.