Finally got to roll the '86 GT into the garage to start adressing its many issues. Among the first is a host of electrical stuff that doesn't work, and some un-professionally "repaired" wiring issues. One of those is a jumper wire from the black/red wire at the radiator fan to one of the wires on one of two relays hanging on the evaporator enclosure under the boot/trunklid/whatever. Have been trying to discern the function of these two relays without success. If they control the headlights and/or headlight motors, that would kind of make sense, since one side doesn't work at all, motor or light. Any/all input is greatly appreciated. Thanks in advance - Chris
Thanks, guys (and/or girl/s?). My instinct is that the A/C power relay controls power to the compressor/clutch, and the high-speed blower relay has the heavier wires (pink) to run the blower motor? Two 16 gauge brown wires into and out of the A/C power relay? Not sure which way the previous owner was trying to go, but either powering the fan off the power relay or the other way around. Joy. Oh, well. Knew it was going to be a while before it was ready to drive hard. The Tail of the Dragon will wait...
By the way, any input on where I might find the radiator fan relay, fuel pump relay and rear brake/turn signal relays? Think I found them near the left hood hinge on the wife's '84 2M4, but not so much on MY car...
AC/Heat blower use 3 resistors and relay at high speed. Relay is off when Blower is at lower speeds or off.
Gen1 HL motors use 3 relays. One at each motor to open and One to close both.
------------------ Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should. (Jurassic Park)
According to the book, the fuel pump and coolant fan relays supposed to be near the drivers side deck lid hinge (ie, at the rear of the car) and they've been in the same place on all 3 Fieros I've owned so I am guessing it's pretty stock location. If not there then someone moved them. Don't think the brake lights have relays, just direct wired. Turn signal flasher is under dash near the steering column, no other relay though, just direct wired.
------------------ Anything I might say is probably worth what you paid for it, so treat it accordingly!
More thanks! By accident, I discovered that Fiero Store has SOME relay locations listed in their Tech tips section. Shows cooling fan relay in front of the left headlight, but doesn't state years or models. Nice to know there's another resource available.
Yeah, I think I just found the fuel pump and fan relays. Right where ltlfrari said. Had to remove the left side cover/vent to find it. Thinking back, I believe that's where the 4 relays are on the '84, too.
Originally posted by ltlfrari: According to the book, the fuel pump and coolant fan relays supposed to be near the drivers side deck lid hinge (ie, at the rear of the car) and they've been in the same place on all 3 Fieros I've owned so I am guessing it's pretty stock location. If not there then someone moved them. Don't think the brake lights have relays, just direct wired. Turn signal flasher is under dash near the steering column, no other relay though, just direct wired.
Don't know what "book" you have... that is wrong. FP and AC clutch is in back, outboard to left deck hinge. If you think 1 is bad many just switch plugs because both use same relay and see if "fix" the problem. Rad Fan is in Front of left HL assem, outboard to left hood hinge.
Only 84 have relays on rear lights. was so all rear bright red work for brake/turn. Later notches stop that so only 2 lights each side work for brake/turn.
Okay, my '86 GT 2.8 4-speed has 2 relays in back, neither has the heavier wire for the fan. One relay in front, other than the three for headlights and two at evaporator, and it HAS the heavier wire. Maybe something was changed for '87 (or mid-year) for some reason. My Chiltons manual has a lot of good information in it, but it's lacking in some areas. The info on Fiero Store is handy, but I wish it were more detailed. And I wish I had my own factory service manual.
