| | | quote | Originally posted by saving_rossi:
I am almost done with my 3100 swap. I have some questions for anyone who is more familiar with electrical than I.
First, I have a bunch of leftover partially connected grounds. They are all connected—some light duty wires come from the ECU and splice into thicker ground wires, but most of the thick ground wires connect to parts of the harness I no longer use. Most of what I just said is useless but my point is I want to understand what I should be thinking about when routing and connecting ground wires.
Second. I believe the starter wiring for the automatics was through a different C500 pin than the manuals, and connected to a plug into the auto trans. I am manual swapping and will not have that. Can anyone explain how the starter system will work so I don’t mess this up royally? I have some understanding of electrical engineering as I’m going to school for it. But I just want to know what path the signal takes.
Third. This is not important but it is making me very suspicious. I inspected my C203 connector, and the final pin has a purple/white wire attached. This only exists on 1984 Fiero’s, 1985+ should have a solid purple wire. The guy I bought the 85 2m6 from was very defensive about it “not being a swap”. The VIN plate up front is rustier than the rest of the car. Could something be going on or am I trippin? |
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For grounds... every ground wire (as long as you are sure it's actually a ground wire) should defintely be grounded. I forget really how the Fiero had it from stock, but typically the decklid hinges both had grounding straps that were tied in via the decklid hinge nuts, that then also tied into the engine block directly by itself. I also (personally) added a couple of grounding straps from the subframe to the actual frame, and from the subframe to the motor and transmission itself. You can never have too many grounds... and I say that because the positive wires are all connected directly via actual wires... but the whole car basically shares a common ground, and these grounds often fail at different points (rust, they come loose, etc.) and that then becomes an issue.
As for 84-85... the only thing I will mention is that a lot of weird things happened with 1985 Fieros. They made so many cars in 1984, that other than obvious body changes (like the decklid, and a few changes in switches and control arms and such), there were a lot of things that were in 84 Fieros that carried over into many of the 85 Fieros... that were replaced 1/3rd or halfway through production. For example... in 1985, the Iron Duke got a roller cam to replace the hydraulic flat-tappet lifter cam. But like... nearly half the Iron Dukes in 85 got flat tappets while the rest got a roller cam (which is way better). Additionally, the wiring harness for the 84 changed somewhat, but they left a lot of it the same, like... 85s have a plug for an additional fan switch (red plug), which isn't connected in 85 and does nothing... but was for the dual-speed fan switch on the 84. There's a whole bunch of other things too... but the for sure way to tell if the car is an 84 or an 85... is by looking at the front control arms. There are some other areas as well... such as where the C500 connector is located (if I remember correctly). But check your control arms first...
See this thread:
https://www.fiero.nl/forum/...120111-2-110639.html
