in the rear passenger wheelwell of my 85gt fiero. what are these things? they kind of look like the fuel pump relay in teh enging compartment. are these for the brake lights and turn signal lights ?

There aren't any relay-type thingies in the wheelwells as standard, as far as I know!! Can you get a picture? Maybe somebody has relocated the fuelpump and A/C relays for some reason? ?? How many terminals on each relay...and what stops working if you disconnect them?
Nick

well, one of them is completely burned out. like it was in a fire burned out. the fuel pump relay is against the firewall. these are located in the rear of the pass side rear wheelwell.....ill try and get apic of them tomorrow. does anyone know if the turn signal wires that go to the rear brake and signal lights have a relay before goin to the light bulbs?cause my rear right signal and brake lights dont work but the rear lights for drivin come on when i turn my headlights on like they are supposed to.

The only stock thing I can think of in that general area is the trunk mounted fan (on early v6s). It had a relay attached near/on it, but as I recall everything was actually inside the trunk, not in the fender well. Might have been some aftermarket item. The rear light and cruise control wiring does run along that side and then across the back of the car. Maybe someone was trying to make their own version of sequential flashers!

[This message has been edited by 2farnorth (edited 12-24-2006).]

quote Originally posted by romeo: does anyone know if the turn signal wires that go to the rear brake and signal lights have a relay before goin to the light bulbs?cause my rear right signal and brake lights dont work but the rear lights for drivin come on when i turn my headlights on like they are supposed to.

Theres no relay before the tail lamp harness back in that area--there is a ground attached to the frame with a 10mm bolt. Check your bulbs for the other problem.. What color are these relays , about how big in size are they, do they look like the fuel pump and a/c relays?

the bulbs all are good. and yes, they look like the fuel pump relays. i assume one is the cooling fan for the motor, dont kow what the other one is.

there is a wire that comes out of the wiring harnes cluster. its black and jus hanging there. it looks like a ground but whenever i attach it to the frame of the vehicle the fuse for the fan blows out.

The fuel pump relay is mounted on a bracket with one or two other relays, the bracket is on the forward firewall in front of the air cleaner housing, just below the glass, about where the driver's neck is on the inside.

There are no relays in any of the wheel wells, too much water and dirt to make that a desirable place to mount components of the electrical system.

James

Ok, just looked at my 86 GT. The wheel well liner has been removed so I had a fairly good look. I did not see any relays. What I did see was the wiring harness running along the frame with wires branching off to: a ground, the side marker light, the rear blower motor (through a rubber grommet), the right rear lights, and then into a bigger loom heading towards the center of the car.

Do you know if the previous owner had something added back there like the sequential tail lights mentioned above?

no, i dont think any of that was done back there. i definately think one is the blower motor relay. im not quite sure what he other one would be for tho. there is a lime green wire hangin loose there too. im wondering if that has anything to do with my right signal light and right brake light not working . im not sure as to where that lime green wire should be going. any ideas?

It sounds like someone has hacked the wiring.

Pictures of the relays and wiring would be helpful since we're dealing with non-stock wiring here.

James

Yes, pictures would be nice.

here are some pics i took today. they prolly wont come out clear. but if u look at the wiring loom near the battery there is one black wire that was cut coming out of that cluster that goes nowhere. i thought it was a ground but whenever i ground it the fan fuse blows out. then there are the two relay thingys and there is a hanging lime green wire from the bottokm and two dark green wires comin from the top. any clues what t hey could be?


if u had to trace the wiring from front to back to diagnose a brake light and signal light malfunction where would u start? where do they originate ?








thanx in advance guys

[This message has been edited by romeo (edited 12-30-2006).]

You're going to need a C500 pinout guide (that's the large connector by the battery) to trace the wiring to the lights and to figure out what that black wire does. Thought I had one but couldn't find the link. Those two relays pictured are not stock. I can't for the life of me figure why someone would put something like that in the harsh environment of a wheel well. The cooling fan mounted in the trunk has it's own relay mounted right next to it in the trunk. The only thing I can figure is that someone tried a homemade sequential turn signal. You'd probably be better off just reconnecting everything back to "stock" and eliminating those relays.

I'll keep looking for a link to the C500 pinout. By the way, what is the year and model of the Fiero? There are some minor differences between some models
Dave
try this link: http://www.nicx.com/fierohlp/Page8A-202-3Fiero86_Service_Man-C500.pdf

I can't see the black wire in the pics. Is it coming out of the C500 connector or just in the wiring bundle coming to it?

[This message has been edited by 2farnorth (edited 12-31-2006).]

it is coming out of the connector bundle towards the back of the car. its in the pic but its out of focus and u cant tell what it is. its an 85 fiero gt 4 speed.

Am I seeing your pictures right in that the C500 terminal has wires coming out the bottom?

Does your car have a third brake light? If not maybe the previous owner used a realy to rectify the turnsignals into a third brakelight using a pair of relays (it's shitty bout it would work). was there an aftermarket spoiler on it? possibly with a brake light?

quote Originally posted by Hudini: Am I seeing your pictures right in that the C500 terminal has wires coming out the bottom?

what do u mean....comin out the bottom? the bottom of what?

The only black wire listed to the c500 is to post A2. That is the side that goes to the engine. It is listed as "battery (ground)".
Check the other wire colors as they are shown in the link. Just remember this link is for an 86, I assume it's for a V6 since it shows a wire for the trunk fan. There could be some minor differences. I read a couple of old posts when looking for the link and it was noted that sometimes 2 connections for rear lights had to be repinned when swapping from a 4 cyl to a V6 and 2 others for neutral safety switch when swapping from auto trans to manual trans. Since yours was put together from other cars we don't know what you have.

quote Originally posted by romeo: what do u mean....comin out the bottom? the bottom of what?

Out the bottom of the C500 terminal block. I'm probably just looking at it wrong. I moved my C500 block when I put an oil cooler there and do not remember looking at the bottom to see how the wires were routed. The C500 sits flush on the bottom so the wires sticking straight out means tampering there. However, I am not sure if they are supposed to be there and were just pulled straight out instead of laid flat like normal.

Unfortunately, I suspect he will have to do some serious continuity testing to sort it out.

[This message has been edited by Hudini (edited 12-31-2006).]

yah, there are wires stuck together goin into the rear wheelwell from teh top with those crush wire connector thingys. i dunno why he put them down there but it jus adds to the mahem of figuring this out. i saw the wiring schematic for the 500. do u think its the same for my 85gt?

Quick check would be to print out that C500 diagram and check the color codes on the wires on yours. Also, if you have a multi-meter, turn on the parking lights and check for power at the proper connector like F7.

quote Originally posted by romeo: i saw the wiring schematic for the 500. do u think its the same for my 85gt?

It should be very close.

ok, heres the deal...i got almost everything to work. those relays are jus there for decoration...lol. i gues he jus used them to extend the wires from one spot to another. i took the relays off them totally and they still work. i dont get it . anyway, after studying the c500 diagram thingy i was able to find a constant power to one of the bulbs and experiment. i used a shovel to apply pressure to the brakes and used the orange wire that gave power to the left side lights . after looking at the wires runnin thru the relays i came to the conclusion that there was a break in the wires and connected them directly . now i have brake lights on both sides. the right still doesnt have both bulbs working when im on the brakes but at least one of them comes on now and i have a right signal. thats one project down , 2 to go. i jus wanna say thanx again to everyone who heped point me in teh right direction...u guys are the best

Glad it's working out. Good luck with the rest of the projects.

Dave