Big Problem There Isn't One Wiring "Map" for Fiero that anyone can publish. Many other cars are the same regardless what a poster on the wall says.
Whole car wiring can and will change for many options. Big one is Auto vs Manual Trans cars then add AC vs Non-AC for each type. So right away you have 4 major maps. Then add engine bay wiring for each engines... HEI Duke, DIS Duke, and V6 in auto and man trans setups. You have Six 500 zone sub-maps at minimum for 85-88 Fiero.
That's ignoring 84 had it's own wiring plan because didn't used V6 engine. Plus 84 had C500 carrying heavy current output from the alt and fuse links at the starter too. All Later years had the Main Power Junction "Box" under C500 w/ all fuse links etc at the point.
This is why one part of problems using Haynes and others are crap to trace wiring problem. Worse, Haynes and Chilton have a lot of missing data for many wiring and other issues.
Sorry but you can't trust many FSM either. Just for Fiero alone GM/Helm have Cut/Past many pages, even entire sections, from other FSM and never bothered to read the data. Even then many wiring diagrams are missing info like Fuel, Engine Temp and OP gauges have a resistor on back and never cover in the FSM at all and dash dimmer circuit diagram doesn't = what in the car completely.
Some TSB you get thru Alldata etc have updates to FSM but many "errors" are never corrected even this way. Example: You only get correct rear brakes section in 87 Fiero FSM, early years have wrong pictures at minimum.
You should read FSM on how to read the wiring diagram or at lest See my Cave,
Wire Reading even if you only have Alldata or Haynes etc rags because many are copy/pasted the same factory diagrams.
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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)
The Ogre's Fiero Cave
