2003 Tahoe 4.8/4L60 drivetrain into 1974 GMC fleetside Wiring issues.

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ohmslaw

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Looking for some help transplanting the entire Tahoe wiring system into the GMC. I managed to do the engine and trans swap (pictures and story to come) but am trying to work out the electrical gremlins.

I have every wire out of the totaled Tahoe donor including fuse panel factory harness the factory steering wheel with cruise control, PCM, and body control module.

The basics are all connected I have power to the fuse panel but nothing to the dash PCM and OBD II connection point. I have a code reader and am stuck with no voltage, what am I missing? I had the PCM reflashed and been told the security codes cleared. Also engine wiring harness was rewired and "guaranteed" to work.

I believe it has something to do with chassis wiring.
 

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