I recently replaced my blower relay for a 1986 GL non-ECU. The relay was behind the dash driver's side. There were four relays. One was for blower, one was for left headlight, one for right headlight. I can't figure out what the fourth is for. I've disconnected the relay and tried all electrical systems that I can think of and all work. Does anybody know what the fourth relay is for?

The forth one is for the rear defogger.

Figures. That's about the only accessory that I didn't try. Thanks for the info.

Your welcome Yorab.