Adapter Harness - Caterpillar 40 Pin to 70 Pin

Simplify your Caterpillar engine conversion with the Kustom Truck Direct Fit Adapter Harness. This economical solution adapts Cat ADEM2 (40 Pin) chassis electronics to Cat ADEM2000/ADEM3 (70 Pin) engine electronics when your existing engine control harness (from ECM to firewall) is still in good condition. No need for a full harness replacement. One end plugs directly into your ADEM2 40-Pin firewall harness, while the other connects seamlessly to the Cat 70-Pin ECM (ADEM2000/3). this harness ensures reliable communication for heavy-duty applications. Note: Confirm compatibility with your specific engine and chassis by contacting Kustom Truck for fitment verification. The harness is compatible with the following engines:

Fits These 40-Pin Chassis / Engine Prefixes:

• 3406E: 5EK, 6TS, 1LW, 5DS
• C12: 1YN, 9NS
• C10: 2PN, 8YS
• 3176B: 9CK

Compatible with These 70-Pin ECM Prefixes:

• 3406E: 2WS, 1MM
• C-15: 6NZ, MBN
• C-16: 7CZ
• C15 ACERT: BXS, MXS, NXS
• C13: KCB
• C12: 2KS, MBL
• C11: KCA
• C10: 3CS, MBJ

Ideal for mechanics and fleet owners performing engine swaps in Peterbilt, Kenworth, Freightliner, Western Star and other heavy-duty trucks. The harness features durable construction and precise fitment for reliable performance.

Kit Includes:

• (1) Direct Fit Adapter Harness – Cat ADEM2 40 Pin to Cat ADEM2000/ADEM3 70 Pin

Key Features:

• Adapts Cat ADEM2 (40 Pin) chassis electronics to Cat ADEM2000/ADEM3 (70 Pin) ECM
• Plugs into existing 40-Pin firewall harness and connects to 70-Pin ECM
• Supports listed 40-Pin and 70-Pin engine prefixes above
• Cost-effective alternative to replacing the entire engine harness
• Precision-engineered for reliable communication and long-term durability

Enhance your Caterpillar engine conversion with Kustom Truck Parts’ Direct Fit Adapter Harness — built for reliability and cost-efficiency.