Electronics Need help wiring something up? Thinking of adding an electrical component to your car? Need help troubleshooting that wiring glitch?

c100 and aftermarket harness

Old Jul 15, 2012 | 09:57 PM
  #1  
thunder57's Avatar
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From: St Catharines
Car: 1987 IROC
Engine: LS1
Transmission: T-56
Axle/Gears: 3:42, 10 Bolt LT1
c100 and aftermarket harness

I'm running a Current Performance harness and need some help with hooking it up to the C100 connector. Here is the pinout:

https://www.thirdgen.org/forums/atta...89-89c100a.gif

Is there a wire out of the c100 which gives a cranking signal? This is used to feed power to starter relay in the harness. Would this be B4 (Starting System)

The harness has its own fuel pump relay and it is used to supply power to the pump. Is there a connector on the c100 that directly goes to the pump, or should I hard wire it right to the wire from the tank. I see that E6 and G4 are for fuel control.
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Old Jul 16, 2012 | 08:32 AM
  #2  
BigBadLou's Avatar
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Car: '91 Z28 convertible
Engine: TPI
Transmission: T5
Axle/Gears: 3.27 posi disc
Re: c100 and aftermarket harness

You did your homework.
I like helping people who have the right questions and know what they are asking.

Yes, the B4 is the thick starter wire that carries tens of amps to the starting solenoid. It would be hard to splice into it. Instead, I recommend using the CRANK fuse in the fuse box. It carries the same signal, just fused to 3 amps.

Yes, the tan/white on G4 is your fuel pump signal. It continues from the C100 under the driver side door sil to the back of the car where it exits the passenger compartment behind the rear seats and plugs into the fuel tank connector.

Hope this helps.
Lou
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Old Jul 16, 2012 | 11:51 AM
  #3  
thunder57's Avatar
Thread Starter
Junior Member
 
Joined: Jul 2004
Posts: 84
Likes: 0
From: St Catharines
Car: 1987 IROC
Engine: LS1
Transmission: T-56
Axle/Gears: 3:42, 10 Bolt LT1
Re: c100 and aftermarket harness

Thats perfect, thanks for the help.
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