GM Wire Harness Modification | GM LS Mod | LS1 Mod



GM Wire Harness Modification

GM Wiring Modification of LS and LT Wiring Systems

You must have the harness off of the donor LT1, TPI, LS1 engine, undamaged. We re-configure and tail out what needs to be used, to run the engine and transmission correctly, at full power . This is a very complete service we offer, the wire harness also will look new. Our customers use this service to deploy a new modern fuel injected power plant inĀ  sand rails, kit cars, off road race rigs, street rods and 4×4 trucks. You can place the modified wire harness anywhere space and location permits. If you have a required length or drawn up measurements for a specific engine, that we produce a wire harness for, email us we will let you know what the cost. The above wire harness is the I6 4.2 engine from GM.

What You Gain by Using / Modding Your Wiring

You save time, and money by having SSW perform a wire harness modification – on the donor LS, LT, wire harness. You also cut the wait time and know 100% that all of the existing connectors fit on your motor. Many times customers may have mismatched sensors and parts, you can make a note of this difference, SSW will change out for the quoted price. When using a factory harness – SSW does not add length to the harness trunk. So,the length will not be changed, if you desire a longer harness, please look at our “Pro Harness” section and scroll accordingly to the appropriate LS wire system you desire. We return every mod with the following, 100% operational:

  • OBDII Link
  • Service Engine Soon Trigger
  • Tach Lead
  • VSS Lead
  • Transmission Wiring
  • Fuel Pump Relay
  • VATS Removed
  • ECM Programmed With Base Tune
  • Wiring That Actually Works

In Closing

The Speed Scene Wiring harness modification service is starts at $600.00 plus shipping. SSW does not offer a mod service, for a lower price. We provide a reliable and consistent service, that must sustain a specific cost in order to exist. We spend more than 40 hours with your wiring, as well as program the operating system, it simply cannot be done for a cheaper price. As the old saying goes “you get what you pay for”


Contact us to order a modified harness.