DIY Wiring Harness Info

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11-08-2011, 04:56 PM
myzterray

DIY Wiring Harness Info

Found this on a another site and figured it would be pretty helpful to some guys here

http://lt1swap.com/2004vortec_pcm.htm

looks pretty straight forward. im probably going to order a new harness so ill try to modify my old one just for fun and see if it works! from what i see there are 8 wires that need to go to an external source. im guessing you just splice these into the stock harness or to an external power source?

correct me if im wrong please:
blue plug
19 -ignition
20-12v+
33-TCC Brake Switch/Cruise Control Release Switch Signal ???? <--what is this?
57-12v+
58-Class 2 Serial Data??? <--what is this?
75-Off/Run/Crank Voltage ??? <--what is this?

Green
9-ignition? fuel pump?
10- Engine Speed Signal ??? <--where does this go?
46- Check Engine LIght Control ???<--where does this?
50-Vehicle Speed Signal OUT 4k/mile?? <--where does this go?

i have a 96 2 door tahoe with 4wd. im doing a lm7 swap right now. also anyone know where i can order replacement plugs. some of the connectors on the harness broke when i was taking them off.
11-09-2011, 12:10 PM
myzterray

please don't all chime in at once...lol..anyone? anyone?
11-09-2011, 07:56 PM
notfastenuff

Are you planning to run both computers, or do away with the one from the 96?
11-10-2011, 12:18 AM
kerrige

Quote:

Originally Posted by notfastenuff

Are you planning to run both computers, or do away with the one from the 96?

WTF???? Both computers? Why would he do that?

BUMP to get someone with a little more knowledge than me on this.
11-10-2011, 11:48 AM
Frenchy

Lots of guys do the 2 computer setup. Engine is ran pure stand alone. Original controls the rest.
11-10-2011, 12:53 PM
RedHeartbeat

Street and Performance has been doing this conversion method for decades. It works.
11-10-2011, 02:06 PM
myzterray

what exactly would the stock computer control? im not using the 4wd anymore.
11-10-2011, 02:43 PM
RedHeartbeat

abs, a/c, speedometer... other things.
11-10-2011, 02:47 PM
myzterray

Quote:

Originally Posted by RedHeartbeat

abs, a/c, speedometer... other things.

oh ok...well as far as a/c im probably going to either use the tbi a/c compressor or a sanden. just want to see which one will be more cost effectie since they do the same thing. i found the sanden on jegs for 179 and the tbi a/c for 169.