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| Installing the aux gauge cluster in an 84 (Page 2/2) |
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longjonsilver
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JUL 04, 10:00 PM
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Well, another drive revealed other things not kosher with my gages. i was really low on gas and the gas gage was pegged on max, and i filled up and its still pegged on max. hmmmmm no signal at all? My son opened his door and the water temperature idiot light went on. i distinctly remember the brake light going on at first and then now it doesn't illuminate at all. The left turn signal indicator light doesn't light up. The speedo has no light at all at night.
The good things? i really love the look of the GT 120mph gages and the lighting at night (except for the speedo) is really cool. The idiot light for the oil pressure works, altho the gauge is pegged max as i need to change the sensors.
i suspect that some of these things are bad bulbs or bad contacts. i left off the back of the instrument pod so i can access the bulbs, and clean the contacts, but i think i will need to move or resolder some wires on the C206 (?) cluster as well. More research is in order. As i was putting in the C206 cluster i wondered if i was putting it in upside down. i guess i didn't put it in upside down because then the speedo, tach, and coolant temperature wouldn't work.
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I'm the original owner of a white ' 84 2M4 purchased Dec 10, 1983 from Pontiac. Always garaged, no rust, 4-wheel drifts are fun! 3800 SC swap to come![This message has been edited by longjonsilver (edited 07-16-2018).]
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RWDPLZ
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JUL 04, 11:34 PM
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If you swap the 84 cluster back in and everything on that cluster works, that would rule out the wiring.
Lately it seems like more and more of the flimsy plastic circuit boards on the back of clusters are going bad. I've seen several more popular cars now have aftermarket replacements, hopefully something will be available for the Fiero in the future. The fuel gauge in my 120MPH cluster stopped working a few years ago, and I think this is the culprit.
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longjonsilver
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JUL 05, 06:43 AM
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Yeah, i could do that, but the family needs my car running, so for now, i am going to first check all the bulbs and clean the contacts with some 2000 wetndry sandpaper. if that doesn't fix things i am going to make two diagrams for the C206 terminal, one for the 84 and one for the part i pulled from the 86(?) in the junkyard and see where else there are differences between the 84 and the others.
i didn't touch the C203 terminal under the console, i bot another C206 terminal and removed the white wire from #18(?), cut the tan wire and wired it into #17 and then wired the brown wire to terminal #6 where the tan wire was cut, on the perchance that there was a signal and power. No, but oh well. Idiot lights are optional, however if it isn't too hard to wire them in, then i will wire them.
i remember that when i first fired up the car, i got a movement of the gas gage to 3/4 and then it moved back to max, so i believe that there might be a bad contact. Same thing with the brake light, it worked at first then stopped. Could be that the bulb burned out immediately. Also with the passenger door open it sends a signal to the thermometer idiot light, which tells me that the wires on the 84 are in different spots than the other years, not just the two for the rally gages.
thanks again for the write up
jon
ps. i built a tester for the bulbs and cleaned the contacts and tested them. 11 out of 44 tested bad. 3 bulbs tested bad at first, but on retesting them before throwing away proved to be good. Moral: clean the contacts - its important. Now my odometer light, brake light, service engine soon light and left turn signal light work. Something is fishy with the gas gage and no tachometer light. i will try cleaning the contacts on the printed circuit board for the tachometer light. Door ajar signal lights up the temperature idiot light - that must be a different wire on the C206 terminal. i've got to verify all the wires in the C206. i will post my results here
edit: more information for clarity
edit 2: additional information
edit 3: update
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I'm the original owner of a white ' 84 2M4 purchased Dec 10, 1983 from Pontiac. Always garaged, no rust, 4-wheel drifts are fun! 3800 SC swap to come![This message has been edited by longjonsilver (edited 07-16-2018).]
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longjonsilver
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JUL 06, 10:34 AM
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Fiero Wiring Diagrams
https://drive.google.com/dr...CaHpOcEk3WU1CRkFMZDA
Since my fuel gage worked fine in the old instrument cluster, i assume that the fuel gauge in the new cluster doesn't work or only is designed to work with the V6 not the Duke (i know that the fuel pumps have different output pressures, dunno about the fuel level senders output voltages). Maybe i can swap in another fuel gage into my new instrument cluster?
The right door switch turns on the door ajar idiot light when the ignition is on. Perhaps this is why, here is the 84 C206 (?) terminal.
https://s15.postimg.cc/u3lm...6_at_10.26.48_AM.png
Unlike the 87 wiring diagram that i found online referenced above, the 84 diagram doesn't specify the number on the terminal just the color. Notice that the 84 specifies two dark green wires (35 and 146) right next each other. One is for the Coolant temp switch, the other for the trunk ajar light. Hmmmmm . Here is what i have so far:
jon
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I'm the original owner of a white ' 84 2M4 purchased Dec 10, 1983 from Pontiac. Always garaged, no rust, 4-wheel drifts are fun! 3800 SC swap to come![This message has been edited by longjonsilver (edited 07-16-2018).]
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longjonsilver
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JUL 11, 04:17 PM
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When i pulled the oil pressure sender from the bone yard, i got one from an 86 GT 2.8. Apparently it has different threads than the 84 duke. The guy at the hardware store said that they didnt have anything to adapt the threads. Bee Ess. i bot a 1/4" male IP to a 1/8" female IP brass bushing. Teflon tape on the threads and it appears to work fine. i assume if i had bot one from an 85-87 duke that it would have had the right threads. Anyway, it worked. Now i have a pressure signal to my gages. Yeah! i was told on another thread that you need a special tool to remove the 84 duke oil pressure sender. Bee Ess again. A 1 1/16" deep socket worked just fine. Of course if you want to spend $10bucks for a tool you will only use once, go right ahead. Now on to installing a new radio, and trouble shooting my 120mph speedo cluster (open door still sends a signal to the temp warning light). Hey, what an idea, close the door and no more overheating. A champion 3 core radiator has been ordered that will fix that problem the right way!
jon------------------
I'm the original owner of a white ' 84 2M4 purchased Dec 10, 1983 from Pontiac. Always garaged, no rust, 4-wheel drifts are fun! 3800 SC swap to come!
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longjonsilver
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JUL 13, 05:26 PM
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i have been checking the wiring diagrams for the 84 - my copy is a little confusing because the connectors are not clearly labeled. The 85-88 clearly has two grey wires in the C206 connector, but the 84 only has one. Perhaps this is why my speedo and R turn signal don't light up. In addition the door sets off the temp idiot light. But this has me wondering - perhaps i would be better off by using my 84 circuit board and housing and swapping in the GT gages. Hmmmm
jon
edit for update: and that is exactly what i did. It seems to work well now, as i knew that my circuit board was the proper one for my car wiring. HOWEVER the position of the idiot lights, the function of the idiot lights, and the wording of the idiot lights is different on different years. i have an 84 instrument cluster, an 86GT instrument cluster and an 85-87 2m4 instrument cluster and had to reuse my 84 faceplate with the 84 idiot light positions, or else move the 84 idiot light cellulose to that of the 86 GT. i chose to reuse my 84 faceplate with the 86GT gages. That fixed the door's setting off the temperature idiot light and now it sets off the door ajar. 
i recommend that anyone that swaps in the GT gages in an 84 reuse the cluster housing including the circuit board, and reuse the 84 cellulose for the idiot lights.
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I'm the original owner of a white ' 84 2M4 purchased Dec 10, 1983 from Pontiac. Always garaged, no rust, 4-wheel drifts are fun! 3800 SC swap to come![This message has been edited by longjonsilver (edited 07-15-2018).]
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Donster
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OCT 16, 05:56 AM
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Can somebody supply instructions or a link for the installation of aux gauges on an 88 coupe (4 cylinder)?
Much obliged.
Greetz from Germany
\D------------------
Life is good!
Former President of the Georgia Fiero Club
Now living in Europe and finally own a Fiero again!
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Donster
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OCT 18, 04:17 AM
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Nothing? Nobody?
Do the same instructions apply as with an 84? I would find that hard to believe.
Any help would be appreciated.
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fierovandermey87
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FEB 19, 10:28 AM
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Hi there,I have an 87 SE 4cyl, just got the aux cluster and dont have the pigtail for it. Is there a way i can just solder the wires right to the aux cluster? and do i need to modify the surround around the stereo?
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RWDPLZ
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MAR 03, 07:21 PM
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f:0