98-99 3100/3400 Simplfiied wiring harness

98–99 GM 3100 / 3400 Simplified Standalone Harness

Our LMMF Simplified Standalone Harness is built to make getting your engine running quick, clean, and reliable. Designed with all new wiring and connectors, this harness eliminates unnecessary factory wiring and provides a simple solution for swaps, derby cars, race builds, and off-road applications.

Installation is straightforward with a simple power and ground hookup, allowing you to get your engine running with minimal wiring.

What This Harness Does

✔ Simplifies factory wiring into an easy standalone setup
✔ Allows quick engine startup with minimal wiring
✔ Eliminates unnecessary factory circuits
✔ Provides a clean and reliable wiring solution

Features

✔ Built with all new wire and connectors
✔ Simplified standalone design
✔ Minimal wiring required for operation
✔ Durable construction built for race and derby environments

Compatibility

Designed For:

• 1998–1999 GM 3100 / 3400 V6 engines

Also Compatible With:

• 1996–1999 engines when paired with a 1998–2005 ECM

Perfect For

• Demolition derby builds
• Engine swaps
• Race cars
• Off-road builds
• Simplified wiring setups

Notes

⚠ For off-road use only

ECM and tuning sold separately unless otherwise specified.

Optional Add-Ons

• Injector harness adapters
• Tuned ECM
• Party Mode switch
• Switch box setups