The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 89 TBI 350 in my 66....? also some parts swap questions....

BlueJeep · 04-09-2008, 07:47 PM

Pull off the split loom and see where the wires go. It's really basic, the orange wires are hot all the time and the pink ones are hot with the ignition. The wiring harness goes two directions off the engine, toward the driver's side to the bulkhead connector (these are where you'll splice in to your existing truck harness), and off to the passenger side where it goes in to the computer. Inside the truck there is a connector that heads under the dash, that is for things such as the check engine light, the a/c controls, the ALDL connector, and the electric speedo. If you leave the EGR on you won't have to have a custom chip burned, but you might want to to maximize the potential. Overall a really basic swap. There are a lot of online resources, just search for pinouts for a GM 7747 ECM (those are the last 4 digits of the ECM part #).

04-09-2008, 07:47 PM	#8
BlueJeep Registered User Join Date: Mar 2008 Location: Waukee, Iowa Posts: 1,608	Re: 89 TBI 350 in my 66....? also some parts swap questions.... Pull off the split loom and see where the wires go. It's really basic, the orange wires are hot all the time and the pink ones are hot with the ignition. The wiring harness goes two directions off the engine, toward the driver's side to the bulkhead connector (these are where you'll splice in to your existing truck harness), and off to the passenger side where it goes in to the computer. Inside the truck there is a connector that heads under the dash, that is for things such as the check engine light, the a/c controls, the ALDL connector, and the electric speedo. If you leave the EGR on you won't have to have a custom chip burned, but you might want to to maximize the potential. Overall a really basic swap. There are a lot of online resources, just search for pinouts for a GM 7747 ECM (those are the last 4 digits of the ECM part #).