Please Select your options above. For each sub-harness category, your first sub-harness is included in the original price. Additional sub-harnesses are extra and are available per order. Please read the agreement and select your Year Model Key (YMK) HERE
58x adapter harness is extra, but minimal cost
Throttle Body Sub Harness: This harness supports all the throttle bodies compatible with the Holley system. The stock 03+ GMT800 throttle body is an 8 Pin throttle body, and uses the 8-pin adapter. Most all of the 90mm GM throttle bodies use the 6 Pin connector, and uses the 6 Pin adapter. If you chose to run a cable throttle body, the DBC sub harness uses standard mid 90+ IAC and TPS connections.
Alternator Sub Harness: There are only 2 popular option for the Alternators used on LS applications. The standard 4-pin alternators were used on most everything up until 2005. In 2005 you could have either the 4-pin unit, or the new Bosch 2-pin alternator, which has it's own computer, known as a GBCM (Generator Battery Charge Module). To use this 2-pin alternator, the GBCM will need to be used. This is located on the main NEGATIVE battery cable, right at the battery. It will have an amp-clamp built in and the negative cable runs through it. Our integrated harness will plug directly into the GBCM, and an adapter is used at the alternator for correct connection. If you are using the 4-pin alternator, a bypass plug is used on the GBCM connector that allows the correct signal to reach the alternator. Both units are plug and play.
Neutral Safety Switch Sub Harness: This harness supports both style NSS units. Both units work in the EXACT SAME WAY, however the early 2-plug unit is a bit outdated, and can have breakage and leakage issues. Either of the NSS can be used on the 60e and 80e, with 2 bolts to swap them.
PLEASE READ AGREEMENT!!
By purchasing this SMI-IH2-GMT800, you are taking full responsibility for the safety and correct operation of the vehicle it is being installed on. Speed Max Innovation LLC is in no way, shape, or form responsible for your vehicle, or any vehicle involved. This harness is OFF-ROAD USE ONLY.