LT1 Wiring has been committed to providing the highest quality and cost efficient harness modifications for many years. Due to countless requests we are expanding our services to include many more domestic and imported automobiles.

LT1 Wiring will modify your existing engine wiring harnesses for a quick and easy installation. We can take most engine wiring harnesses and modify them to four or five simple wires to make the engine run and retain code free operation.

We add the relays and circuits that were left with the donor car. This facilitates a smooth simple installation into the host vehicle.

If you don't see anything for your particular application here, just call and we'll be glad to discuss your project with you. If you'd like to have the same clean, CODE FREE wiring and custom electronics that so many other professionals and enthusiasts have, consider LT1 Wiring for your next project vehicle.

......"check engine" lights......are just plain ugly.


Stand alone Rewiring

1996 - 2000 4.3, 5.3, 6.0 truck harness.


2001 - 2006 4.3, 5.3, 6.0 truck harness.


LT1, LT4 F-body.


LT1 B-body.


LS1, LS6 F or Y body engine.




Custom Harness Graft

Complete wiring graft between any fuel injected GM engine and most any make vehicle 1980 to 2008.


Computer Flash Calibration

Most any computer or memcal reflash if we process the wiring harness.*

Flash Program PCM LT1: $50.00
Flash Program PCM LS1: $100
Flash Calibrate PCM E-Series: Quote
Calibrate Memcal: $100

To remove VATS from any truck computer,"without harness modifications".


Perform any truck computer complete reflash "without harness modifications".


Perform LT1 LT4 LS1 computer reflash "without harness modifications"


* indicates computers and memcal's we support, please email with your information.
Some newer models will carry an additional charge.