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How to Wire LT1s

The LT1 is a popular small-block engine made by General Motors. First appearing in 1992, it was the powerplant of choice for various Chevrolets, Buicks and Pontiacs throughout the 1990s. The LT1s wiring uses a single harness, consisting mainly of simple push-on connectors. If you stay organized and plan correctly, a complete LT1 rewire is not a difficult project.

Instructions

1

Shut off the engine and raise the hood of the car. Reach inside the engine bay and locate part of the wiring harness. It is one long length of heavy cable insulation that branches off to many different parts of the car. It doesnt matter where you start; just locate one of the electrical sensor plugs.

2

Identify the component to which the plug is connected -- for instance, the air conditioner, the injector or the oxygen sensor. It can help to have your user manual handy for this. Write the name of the component on a piece of masking tape and wrap it around the connector. Continue and label all of the connectors.

3

Use the erence diagram for the new wiring harness to label all the connections on it. Familiarize yourself with all the locations of the connections, and start looking at the routing of the cables. Some sections of the harness are secured using plastic hooks to bundle the cables to the wall of the engine bay.

4

Enter the car and slide all the control knobs off of the switches and sliders on the dash. Store them in a safe place. Remove the screws holding the dash to the firewall and lift it out. The tension of the existing wires will only allow a few inches movement so you can lean the whole assembly against the steering column.

5

Label all the connections on the back of the dash, just as you did in the engine bay.

6

Place the replacement harness into the engine and position all the connectors in their appropriate places. Do not connect anything yet, just move the cable into position and make sure everything is routed correctly, and that the cable can reach all of the relevant connectors.

7

Reposition the cables from the new harness so they are underneath the old one. This will make it easier to remove the old harness without accidentally yanking out the new one.

8

Remove the old harness by squeezing the small sprung clip on each connector, then wiggling it out. Work through each connector one at a time, removing the old connector, and replacing it with the new one. Swap over each connector in the engine bay, then on the back of the dash.

9

Lift the old harness out of the car, taking care not to snag it on the new one. Work around the connections again, making sure all the plugs are firmly seated.