Wiring harness question.

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Jun 10, 2013 | 06:16 AM

operatorfailure

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From: Springfield, MO

Wiring harness question.

I about have my wiring harness finished, I'm just curious what everyone does with their switched ignition wires. (Pink wires) I have heard not to run them all together, and I have heard some people do. I have the fuse block that lt1swap.com reccomends, and it has three spots for switched ignition so that's my plan. Just curious what everyone runs together.

I'm at work, so I don't have my harness with me but from memory there are 8 injector wires, 2 coil wires, 2 O2 sensor wires, a MAF wire and three or so going into the ECM. My question is, what ones should I run together?

Run the 8 injectors on one, the three ECM on another, and the O2s and MAF on the third? What would be the best option?

Jun 10, 2013 | 09:04 AM

BP Automotive

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From: Columbia, Kentucky

Quote:

Originally Posted by operatorfailure

Three ignition fuses are not enough. No matter what that site says and what other people have done that may have worked, that is NOT the proper way to do it. The fusing should be broken down like this. 4 Ignition Circuits and two battery circuits. This is an example of how the circuits should be broken down.

Engine Sensor
Bank 1
Bank 2
PCM IGN

PCM Batt
Fuel Pump

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Jun 10, 2013 | 01:50 PM

operatorfailure

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I see. Only have one question, what do you mean by PCM IGN and Engine Sensor? I'm guessing bank 1 has the bank 1 coils and injectors, and bank 2 has the bank 2 coils and injectors.

Jun 10, 2013 | 03:03 PM

BP Automotive

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From: Columbia, Kentucky

Quote:

Originally Posted by operatorfailure

I see. Only have one question, what do you mean by PCM IGN and Engine Sensor? I'm guessing bank 1 has the bank 1 coils and injectors, and bank 2 has the bank 2 coils and injectors.

If your harness is a vortec harness then cavities 19 and 75 on the Blue connector will go to PCM IGN

Engine sensor is the O2 sensors and mass air flow, you can also put the transmission solenoids on this circuit or the pcm ign circuit. I put it on the engine sensor circuit because I like the PCM to be on its own dedicated circuit.

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