The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

**pjmoreland** · 09-15-2021, 02:42 PM

They have the harness connector flipped relative to the transmission connector in the diagram. You can tell that based on the empty fourth dummy pin location.

A = 1 (12V from brake switch through closed vacuum switch that powers the TCC in gears 1-3)
B = 3 (12V source provided from brake switch that powers the TCC through the 4th gear switch)
D = 2 (probably connected either to EGR stuff, or nothing)

09-15-2021, 02:42 PM	#10
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,334	Re: 700R4 LockUp Troubleshooting They have the harness connector flipped relative to the transmission connector in the diagram. You can tell that based on the empty fourth dummy pin location. A = 1 (12V from brake switch through closed vacuum switch that powers the TCC in gears 1-3) B = 3 (12V source provided from brake switch that powers the TCC through the 4th gear switch) D = 2 (probably connected either to EGR stuff, or nothing) Last edited by pjmoreland; 09-15-2021 at 02:54 PM.