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Old 07-30-2017, 09:32 PM   #1
bbluma
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Join Date: Mar 2017
Location: Stillwater, Oklahoma
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99 Tahoe Fuel pump Wires/PCM Diagram

Hey Yall, PO transplanted driveline out of a 1999 Tahoe into 66' C10, and well lets just say wiring is sub par lol. So i need some help finding a wiring diagram of the PCM, and if anyone happens to know the colors of the fuel pump wires? Or has a diagram for that? Thanks in advance!
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Old 07-30-2017, 11:07 PM   #2
Captainfab
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Location: Coeur d'Alene, Idaho
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Re: 99 Tahoe Fuel pump Wires/PCM Diagram

Did you ever get the service number from your PCM that I asked you about in your other thread? You will need that number so that you have some sort of idea of what you are working with. Here is a link to a page to get you started, but that info may not be correct depending on what PCM you have.

http://lt1swap.com/1999_vortec_5.7/index.htm
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Old 08-01-2017, 08:40 PM   #3
bbluma
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Re: 99 Tahoe Fuel pump Wires/PCM Diagram

Hey Captain, got swamped with work and all but finally got a pic of the bottom of the PCM, and added it. Hopefully it helps you and can figure out a wiring diagram for it and all. Lemme know, thanks.
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Old 08-01-2017, 11:30 PM   #4
Captainfab
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Re: 99 Tahoe Fuel pump Wires/PCM Diagram

All you have to do is google for the pinouts for a PCM with that service number or a '99-2000 truck. Here is one that poped up but I did not have time to read thru it all.

https://www.hptuners.com/forum/showt...-vortec-trucks
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