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Need help wiring in ECU

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Old May 16, 2009 | 01:05 AM
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Default Need help wiring in ECU

I am modding my own harness and need some tips, based off of http://chevythunder.com/1999-2002%20...%20pinouts.htm

Which wire needs to be constantly +, which wire needs to be ignition +, why are there so many grounds?
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Old May 16, 2009 | 05:01 AM
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4 grounds is a lot? Pin 1 and 40 on each connector is ground (Like the pinout says)
20 and 57 are constant + (Like the pinout says "Battery Positive Voltage")
19 is Ignition + (Again, just like the pinout says)
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Old May 16, 2009 | 11:40 AM
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4 grounds for one device is a lot. is it a failsafe or something?
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Old May 16, 2009 | 03:42 PM
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If it's a 99-02 harness, there should only be three ground wires that bolt to the back of the head. PM me your email and I'll send you the engine harness schematics.
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Old May 16, 2009 | 11:20 PM
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pm sent
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