Originally Posted by rustylog.
The outer headlights go either on or off each time when I click the directional handle up and let it spring downwards on its own accord after being released.
Doesn't that mean the outer headlights are high beam?
All 4 lamps should light on high beam while only the two outside lamps will light on low beam.
Check the connectors on the back side of the bulbs. I believe you will find there are three connections on the outside bulbs and only two connections on the inner lamp bulbs.
If you have a test lamp, remove the connector from one of the inner lamps and probe the two terminals in the connector. You should have power when the switch is on high beam. Does the high beam indicator light on the dash light up when the high beams are supposed to be on?
The first check should be to be sure you either have 12 volts at the inner lamps or you don't. There is a possibility both inner bulbs are bad or there could be loose or corroded terminals if you have 12 volts but the lamps don't light.
If the outer lamps go out when the dimmer switch is tripped you probably have a bad dimmer switch.
I don't believe you will find fuses for the headlamp bulbs. Circuit protection is provided by a circuit breaker built into the headlamp switch.