Is this the convertible / coupe or the K-car Aries / Reliant body style?
Do the low and high beams quit at the same time? The coupe / convertible has a really weird system with a block of relays. The only thing the low and high beams have in common is the switch assembly. Even the bulbs are on separate fuses. Fuse # 17 (left low beam) and fuse # 18 (right low beam) are tied together and are fed from the low beam relay. Fuse # 19 (left high beam) and fuse # 20 (right high beam) are tied together and are fed from the high beam relay.
I recall what I believe was a similar relay block in a Daytona. Those were noted for developing intermittent connections where they were soldered to a circuit board. That was a sealed unit. The relays were not plugged into sockets.
Both relays get their 12 volts from a gray fuse link. That should be a wire in a batch of wires going around the left strut tower. The voltage is applied to one contact of each relay and to one end of each relay's coil. The other end of each coil goes to two terminals on the dimmer switch; the common goes to the headlamp switch which goes to ground.
There's two parking light switches; one is integrated with the headlamp switch, and one is by itself. When your lights quit again, see if it affects the low beams, high beams, running lights, or all three. Also try the parking light switch without the headlights. If only the low or high beams are affected, my approach would be to connect a voltmeter to one of the fuses with a pair of clip leads, then turn it on and take a reading when the problem occurs. Suspect a bad connection on the relay.
If all three become inoperative at the same time, suspect the headlamp switch's ground wire or connection. If the running lights still work but both high and low beams quit, about the only thing it can be is the contacts for the headlamp switch.
Monday, December 14th, 2009 AT 11:49 PM