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Patrick
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FEB 12, 08:08 PM
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Diagnosing electrical issues isn't my strength... but if it was my Fiero, I'd be wanting to know why that relay got so hot that part of it melted. Keep in mind, I hear these cars catch fire! 
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theogre
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FEB 12, 09:20 PM
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With engine swaps and iffy installs most are... you're most on your own finding wiring problems.
You really need 1 or both tools said above. Examples:
https://www.amazon.com/Uni-...itance/dp/B00O1Q2HOQ
https://www.amazon.com/Tool...tector/dp/B000RFOP1I
Or expect to Pay a shop a lot of $ to find and fix whatever. Good luck finding a shop will ever touch 20+ year old cars.
For the moment...
Say If the burn relay controls the F-pump and 2 fan motors...
And If the Relay is "OE/stock type" for Fiero F-pump etc is 20A rated.
F-pump draw 7-10a alone plus 2 more motors often pulling same or more amps = over loaded the relay and the relay burned.
If only this happened... You have to fix the F-pump relay and add 2 more relays for the fans.
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stevep914
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FEB 12, 11:29 PM
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Thanks, Ogre, now that makes a lot of sense! I did not set this up; it came that way when I bought it. I will look into another power source for the fans. Assuming I acquire a new connector, I will still have to determine if the starter will engage , or that is another problem somewhere else. I will continue to update this as I progress…
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82-T/A [At Work]
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FEB 13, 08:42 AM
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I think the Fiero had fantastic wiring from the factory... but I'm starting to wonder if it wouldn't be better for all of us to simply start replacing the harnesses with something newer. Does anyone offer a complete replacement kit for the Fiero's harness? Like through Painless? Specifically... the engine compartment harness, not really concerned about the inside stuff.
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theogre
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FEB 13, 04:04 PM
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| quote | Originally posted by 82-T/A [At Work]:
Does anyone offer a complete replacement kit for the Fiero's harness? |
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Isn't simply to make a kit to replace engine section IE 500 Zone alone.
Ignore 84 that's only 84...
At minimum you have:
85-86 Duke w/ Auto trans
85-86 Duke w/ manual trans
87-88 Duke w/ Auto trans
87-88 Duke w/ manual trans
85-88 V6 w/ Auto trans
85-88 V6 w/ manual trans
That's with "extra" wiring for AC and other things that car may not have.
like owner will "upgrade/downgrade" OP Sender, SI or CS alt, or have extra plugs crossing 87-88 "wall"
Other "odd things" like Think 85 Deck Lid Switch is on 400 zone w/ taillights but later is in 500 zone w/ plug on right side hinge.
Plus many Plugs you can't find from any source.
Not much sense to make many versions for a car that has very limited sales to start and fewer cars now after 30+ years and many don't want or can't afford to buy new 500 Harness.
Whatever "Shop" might make a one off harness but you are going to pay Top $ for it.
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stevep914
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FEB 13, 05:05 PM
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&*€£#+ I am attempting to install a new connector to replace the burnt one on the fuel pump relay. I have a spare 2.8 complete motor and wiring harnesses. The replacement connector off that motor, has four color coded wires; 3 on the top of the connector to mate up with three in a line pins on the relay- blue, green and purple. The fourth wire is black with white stripe, which I presume is ground , and mates up with the 4th separate pin on the relay. Now here is my dilemma:whichever idiot did a wiring job on the motor in the car eliminated the color coded wires from the factory, and has all manner of red and black wires, that are impossible to identify. I can’t find anywhere that tells me which pins on the relay hook up to which of the three wires on the new connector. From what I can assume, on the connector with the three ports at the top, the left one is power, the middle one is the wire to the fuel pump. For some strange reason, the middle port on my car has two wires; one is the fuel Pump power? And the other one hooks up to the third right port along with a wire there, that was the power wire for the fans that were running off the relay. The presumeably ground wire hooked up on the car to a dead terminal ( also burnt) that was not connected to anything, so I am mystified how ground was established. I HATE normal wiring let alone the mess I am trying to sort out here. Anywhere to establish what ports on the connector hook up to what ? I would think you have to have power, ground, and a power wire to the fuel pump. That leaves one terminal to do what?
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stevep914
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FEB 13, 05:56 PM
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Here we go again! I found a wiring diagram with color coding for the relay. The burnt relay is NOT for the fuel pump! My car, and the extra motor, have two relays side by side. One for the fuel pump ( five wire connector) which appears to be in good shape, and the other one with 4 wire connector which is burnt. That is the one I need to figure out. What is this relay for? I do not have an air conditioned car.
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Patrick
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FEB 13, 06:31 PM
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| quote | Originally posted by stevep914:
What is this relay for?
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Yes, I understand that you only have two relays on the firewall... but I found a couple of posts that state the left side relay (not labeled in the diagram) is for the cooling fan(s).
Just to confuse the issue further...
The difference in locations mentioned for the cooling fan relays might be dependent on the year of the Fiero.[This message has been edited by Patrick (edited 02-13-2023).]
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stevep914
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FEB 13, 07:00 PM
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Thanks, now I have found a diagram identifying the colors of wires coming out of the connector off my spare motor ( it was an air conditioned car) That one was for the A/C compressor. The burnt one on my car has no factory color coded original wires, but appears to have been set up to power the two cooling fans in the engine compartment. They were not working after my problem happened; tracing the power wires from the fans led to this relay. So now, unless that relay is responsible for something else as well, I am back to what the real problem with the car is again!
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82-T/A [At Work]
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FEB 15, 12:09 PM
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| quote | Originally posted by theogre:
Isn't simply to make a kit to replace engine section IE 500 Zone alone.
That's with "extra" wiring for AC and other things that car may not have.
like owner will "upgrade/downgrade" OP Sender, SI or CS alt, or have extra plugs crossing 87-88 "wall"
Other "odd things" like Think 85 Deck Lid Switch is on 400 zone w/ taillights but later is in 500 zone w/ plug on right side hinge.
Plus many Plugs you can't find from any source.
Not much sense to make many versions for a car that has very limited sales to start and fewer cars now after 30+ years and many don't want or can't afford to buy new 500 Harness.
Whatever "Shop" might make a one off harness but you are going to pay Top $ for it. |
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I know Ogre... I just really, really want something solid. I've not "hacked" my Fiero wiring, but I know that among other things, the wiring is one of those things which just deteriorates over time... like rubber hoses and bushings.
I've got my Fiero, which I've owned since 1996, and while I've never had any wiring issues, I know that I've been tinkering with the car for years... and I suspect the engine compartment wiring (being that I'm in Florida) is probably barely adequate at this point.
I could build my own, but I just know it wouldn't be the quality that I would come to expect. I rewired my 1973 VW Bus years ago, but that's a 73 VW Bus... like... everything is mechanical, hahah... it was so simple.[This message has been edited by 82-T/A [At Work] (edited 02-15-2023).]
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