Hey all. I need to replace the fuse box on my 1984 Fiero (Indy). I've been looking at the wiring diagrams for the various years online and it's hard to tell which ones would be compatible with mine. The part number on it is 5645-A. Does anyone have any info as to which year/trims/engines would be compatible with mine? I've seen quite a few that look very similar to mine, but have different part numbers. And if anyone happens to have one I'd be happy to buy it off you. Thanks for any help!
Yeah, I've been looking there and on Craigslist, but again, there seems to be quite a bit of confusion as to what fuse boxes will work with which year/trim/engine. I'm trying to find an actual '84 to pull one from, but all the ones I've seen so far are from 86-88 and I'm not sure if that'll work.
The 84 wiring is unique, they made a lot of changes in the later years to accommodate the V6. If you can find an interior harness from an 84 SE, it should be close enough. The power mirrors are their own separate harness if you have them or want to add them.
At this point, I suggest that you browse car-part.com. Restrict to ONLY 1984. Then you have to call around to see who has what. The U-pick yards usually do not know what is still on the car.. but a fuse panel is not exactly a hot item (pun intended). And like going to the grocery store, you can pick up all the other minor items that you have been looking for.
Use car-part.com and similar services at your own risk. I recently had a bad experience on there trying to find a transmission for my Buick Grand National.
I had several places respond to my request, but it was clear they were either office employees, not salvage yard employees and/or working from a call center in India. They work off a script, and can't respond to anything that is not on their script. (In my case, a grand national has a different transmission code from any other Regal, Cutlass, Grand Prix or Monte Carlo, so their standard script about which tranny will fit didn't get them to the right one that I needed).
I'd suspect they also wouldn't be aware of the nuances between different years of Fieros.
Thanks for the tip. Called one of the places listed on car-part.com and they're supposedly sending me one. Told them to verify the part number before sending it so we'll see how it goes. Thanks again!
So wanted to post a follow up regarding my request. As mentioned I ended up getting the fuse box off car-part.com (thanks for the tip @Chris Eddy!!). The reason I needed this was because my fuse box caught on fire. I had just gotten it a few weeks ago and I was driving along with the AC on full for the first time. The AC had just been replaced to work with the newer refrigerants, but it was working fine on lower settings. The car shut off and as I was trying to figure out what was going on I smelled smoke and noticed that it was coming from the fuse box. I pulled over quickly and noticed the smoke was coming from a fuse that was dangling by two wires connected to the fuse box. It fell off onto the floor and smoldered for a bit before I could grab it and get it off the carpet. Just then I realized the fuse box was actually on fire and I quickly patted it out.
I took it to a shop to have it looked at professionally to get their opinion. As mentioned the AC unit was replaced as a condition of my purchase. Since this was the first time I had run the AC full blast I assumed this might have been the problem. I figured the previous owner had to rewire it when they put in the new compressor and ended up running wires through the firewall, into the fuse box, and then put a fuse on it. However, the shop told me the wires didn't run out of the back of the fuse box at all -- they were just connecting two of the fuse blocks with a fuse in between. When the fuse box itself was replaced with the one I bought everything starting working including the AC. It doesn't make any sense and I'm just curious if anyone has any theories.
In the attached picture there's a wire coming out of fuse block 2 and one coming out of block 3. There was a fuse that connected the two wires that completely burned up. The fuse was green (I think 30A).
The saddest part is that it was a 84 Indy with 24k miles on it in shockingly good condition inside and out. Now there's a burn mark in the carpet and my heart...
[This message has been edited by photoneffect (edited 08-23-2017).]
I've removed and replaced a couple of 84 main wiring harnesses many years ago. The fuse box is directly wired into the main harness and will not unplug from it. You will either be splicing a lot of wires or you'll need to replace the entire main harness. This harness is unique to the 84's only. Most of the accessories (power mirrors, power windows, power door locks) have there own separate harnesses. As far as I can remember, it does make a difference if you have cruise control or not, and if it's a manual transmission or automatic. With or with out A/C is also a factor. It's kind of a big job as most of the interior needs to come out, but doable.
------------------ Rod Schneider, Ball Ground, Ga. "You can't have too many toys!" 1988 Fiero GT 1988 Porsche 928S4 1987 Corvette 2016 Mustang EcoBoost Van's RV-6 airplane
I've removed and replaced a couple of 84 main wiring harnesses many years ago. The fuse box is directly wired into the main harness and will not unplug from it. You will either be splicing a lot of wires or you'll need to replace the entire main harness. This harness is unique to the 84's only. Most of the accessories (power mirrors, power windows, power door locks) have there own separate harnesses. As far as I can remember, it does make a difference if you have cruise control or not, and if it's a manual transmission or automatic. With or with out A/C is also a factor. It's kind of a big job as most of the interior needs to come out, but doable.
I ended up having the shop do the work since I figured they'd have to trace those two random wires through the firewall to figure out why they were there. The replacement fuse box I bought had all the wires coming out of it so they just spliced them all in to the existing wires. Didn't take very long and nothing had to be removed in the interior. Just a lot of soldering!
