1998–2005 GM 3800 Supercharged L67/L32 Simplified Harness — ECM Sold Separately

1998–2005 GM 3800 Supercharged L67/L32 Simplified Harness

Simplified standalone harness for supercharged 3800 builds — tuned ECM sold separately.

Built for 1998–2005 GM 3800 Supercharged L67 and L32 engines, this LMMF simplified harness removes unnecessary factory wiring and gives your derby, race, off-road, or engine-swap build a clean, dependable setup. Built with new wiring, connectors, and heavy-duty loom for a durable installation that is easier to wire and troubleshoot.

Harness kept in stock • Usually ships within 1–2 business days • Tuned ECM available separately • No core required for the ECM

Fits

• 1998–2005 GM 3800 Supercharged L67 / L32 engines
• Demolition derby, race, off-road, and simplified engine-swap builds

What’s Included

• Professionally built simplified standalone supercharged 3800 engine harness
• All-new wiring, new connectors, and heavy-duty loom
• Clearly labeled leads for ignition, fuel pump, power, and grounds
• Essential circuits for a clean, simplified installation

ECM Sold Separately

This listing is for the wiring harness only. A tuned ECM is not included with this harness.

LMMF offers compatible tuned ECMs separately. No ECM core is required when purchasing the compatible tuned ECM.

Compatibility Notes

• Designed for 1998–2005 GM 3800 Supercharged L67 / L32 engines.
• 2004–2005 Series III Grand Prix applications require a different harness.
• Contact LMMF before ordering if you are unsure about engine year, engine code, ECM needs, or vehicle compatibility.

In Stock & Fast Shipping

This harness is kept in stock and usually ships within 1–2 business days.

Built for Simple Installs

Skip brittle factory wiring and unnecessary circuits. This harness is made to keep your supercharged 3800 build clean, dependable, and easier to get running.

Plug it in. Pair it with the right ECM. Send it.