My Daughter has a 85 Pontiac Fiero and she had a small fire under the dash on the left side of the fuse box, because of a extra wire I had added going from the fuse box to the fan motor, The wire was to small and got to hot. anyway thats another story, The wire got to hot and started a small fire, it doesnt look like it hurt the fuse box except for minor damage to the left side but not serious, I changed all of the fuses just to be on the safe side. but after she drove it a couple days she noticed the RPM gage and the Temp, Oil, and Gas Gages are not working. The car is running and she can still drive it.
I took the two screws loose that hold the fuse box to the under side of the dash and checked out the back of the fuse box for damage, and it looks fine. No wires melted, I did notice a small cluster of wires just to the left of the fuse box that looked to be melted together so I seperated them one at a time and taped them up but the Gages still don't work. I also bought a Computer off ebay for the car and replaced it but still no change ??? Also I did make sure I dissconnected the battery before I worked on anything. Does anyone have a ideal what the problem might be ?? I would appricate any Help....

First, If you are hot wiring the fan on all the time you must wire it with a 30 amp relay with a trigger wire to the ignition. Can't straight wire all that power draw to the fuse box. It will continue to catch fire. That's not good for your daughter and the Fiero Repitation

But on the gauges, it sounds like the problem is that set of wires on the left side that melted toghter. It must have burnt one or more in two. Need to search those wires to make sure they are connected from end to end.
I would take a volt meter and find both far ends and see if you have connectivity from end to end. Example: Find where the melted wire goes to the gauges, put one tester end on that end and then trace the wire back to the fuse box and put the other tester there to see if they are still connected with the melted part in the middle.

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Car Thread:
86 GT
https://www.fiero.nl/forum/F...ML/085541.html

You could have simply blown a fuse. I think Fiero is the same as most cars with the panel lights fused with tail lites. I dont have a schematic to see. They do that intentionally so that you know when your tail lites are not working (panel lites are out). If thats not it, use a test light and backtrack the panel wiring till you find where its dead.

Thanks jwrape,
If i can get my Daughter to stop drving her car long enough I'm going to try and check out all the wires again. It didn't look like any were burnt in half just melted together and i think i got them all seprated and re-taped with elect tape.
Thanks for the info.

and


Thanks Rogergarrison,
The dash lights are working, It's my RPM, Gas, Temp and Oil Gages that stopped working, Speedomitter still works. I did change all the fuses in the fuse box but I was thinking there could be another buse block somewhere else that could be blown. If anyone knows of one please let know.
Thanks for the info.

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eknopps

[This message has been edited by eknopps (edited 01-29-2012).]

To determine the extent of the problem, also get her to check the following to see if they work or not:

a. brake warning light (ie put the parking brake on);
b. Upshift indicator (if manual trans);
c. Service Engine Soon light (ie stick the key in the ignition and turn it to RUN not start and light should turn on);
d. hood/trunk/door ajar indicator (open a door with the ignition in RUN);
e. key chime

If none of these items work either, then the problem is with the pink and black wire running from the Gages Fuse to a factory splice called S203 and then on to each of the circuits listed above. Post your results and I or someone else can help pinpoint the problem.

Bloozberry,
This is what we found:

a. brake warning light - Not Working
b. Upshift indicator - This car does not come with one.
c. Service Engine light - Not Working
d. hood/trunk/door ajar - Not Working
e. key chime - This car does not come with one.

We got a late start on looking at the car so we will need to go back under the dash and see if we can locate the pink and black wire you were talking about.

does anyone know where I can get a wiring diagram that shows these wires ?

http://www.fieronews.net/fusion/downloads.php

OK so the problem appears to be the pink/black wire running from the Gages Fuse to splice S203. Splice 203 is not going to be easy to get to since it's buried in the main wire bundle that runs up behind the dash and feeds the entire instrument pod. Hopefully you'll find the problem closer to the fuse panel. Aside from being able to swing down, the panel is held up under the dash with two or three 7mm screws. Once you remove the screws you should be able to drop the entire fuse panel frame and twist the panel around to inspect the wires leading to and from the Gages Fuse. With any luck, you'll see the problem without having to remove the dash.

We did remove the screws where we could see the back of the fuse box and everything looked to be ok, So its looking like it might be some where else. I need to get back under the dash and see if I can locate the pink and black wires.

Thanks again for the info.

Daughter drove back home today so it will probably b the weekend before i can look at it again.

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eknopps

I looked at all wires behind the fuse box and also put a fuse tester on each fuse and everything looks ok but the gas, temp, oil and RPM Gages and also the check engine etc... are not working. Basically the only thing working on the dash are the lights and the speedometer. I looked at the Pink and Black wires on the back of the fuse box and they did not look to be damaged. Could there be something somewhere else that might have gone out when the wires melted together ? I doubled checked the wires that melted together and after I separated them ( one at a time ) they looked to be intact, I taped each wire separate with elect. tape. HELP...... I'm at a loss..... I thought about taking the dash loose but I really don't see where there was anything damaged other then the one cluster of wires that I separated... Anyone got any other Ideals ??? could there be a relay that burned out somewhere that would effect all the gages ??? Temp is showing in the red all the time even when switch is off and so is the Oil pressure, RPM's are staying at about 1500rpm and don't go up or down. gas gage is staying at 1/4 tank. Any Thoughts out there ????

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eknopps

Well after taping wires and changes fuses and spicing a couple wires Gages seem to be working, I also put the old computer back in ..... Only thing not working now is the Speedometer stopped working and the weird thing is the Trip meter stopped working also... Plus I'm not 100 % the gas gauge is registering right.... If anyone has any ideal why the speedometer would have stopped working I'd appreciate any Info. Thanks

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eknopps

The spedomeeter issue could be one of several problems:

1. make sure the speedometer connector is properly seated... it's the one that is plugged in vertically near your left knee once you remove the trim panel under the steering column; if that's not it then,

2. check that the speed sensor connector at the transmission is properly connected... it has only two wires: a purple and a yellow wire; if that's OK, then

3. unplug the connector under the dash, and use a test light or voltmeter to see if you get 12V on pin T (one of the two yellow wires) with the ignition in RUN (engine stopped); if you don't get 12V then

4. check for a burnt RADIO Fuse; if you did get 12V then

5. check to make sure speedo pin D (black wire) is connected to ground (a mulitmeter set to ohms with one lead on pin D and the other on some shiny metal should give you zero ohms); if it gives you infinite ohms then

6. the black wire on pin D should be cut and spliced to a known good ground.

Edit.. nevermind!

[This message has been edited by weloveour86se (edited 03-27-2012).]

You Guys have been GREAT !!! The info provided has able me and my Daughter to get everything working on the dash of her car.... Thanks a Million !!! I do have one remaining issue that I'm not sure of and thought someone might be able to help. The Temperature Gage keeps going from showing 220 to Red lining, mainly when its setting still, I don't think its running hot all the time because when you turn the car off no water is coming out the overflow. I'm thinking it could be a sensor problem... If it is a sensor where is the sensor located on the 4 cylinder Fiero's ?? How easy is it to replace for a Non Mechanic like myself ?? I also noticed when you first start the car it runs and idles good but after you drive it a while it gets hard to start and looks like its smoking allot, I've checked the oil stick and don't see any moister on it, Thinking she might had blown a head gasket. it seems to run down the road great and after its driven it doesn't seem to smoke any more. I'm thinking it might be a gas issue not a oil issue but again I'm no mechanic. I Appreciate Anyone's ideals or Comments ??
Thanks again for all the help.

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eknopps

I think the Head Gasket has blown, Going to put it in the shop as soon as we can get the funds up..... It never ends does it......