The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 1988 Canadian GMC C1500 305 TBI w/TH400HD going into 1973 C20 Custom Crew Cab

dwmitchell61 · 07-29-2015, 01:03 AM

July 25-27 - Laid in harness wiring in the firewall area, repaired some grounding lugs that had wire damaged near the lug.
Removed the heater control relays from the 1988 for re-utilization on the 1973. Will need a relay for the Park/Neutral signal to ECM. Another will be needed to kill the circuit for the downshift solenoid when the brakes are applied. I will use a third energized by the 1973 ignition switch RUN to power the distribution of power needed by the ECM and injectors during operation from the battery +.

07-29-2015, 01:03 AM	#5
dwmitchell61 Registered User Join Date: Jul 2015 Location: Benton City, WA Posts: 37	Re: 1988 Canadian GMC C1500 305 TBI w/TH400HD going into 1973 C20 Custom Crew Cab July 25-27 - Laid in harness wiring in the firewall area, repaired some grounding lugs that had wire damaged near the lug. Removed the heater control relays from the 1988 for re-utilization on the 1973. Will need a relay for the Park/Neutral signal to ECM. Another will be needed to kill the circuit for the downshift solenoid when the brakes are applied. I will use a third energized by the 1973 ignition switch RUN to power the distribution of power needed by the ECM and injectors during operation from the battery +.