LS Jeep JK wiring - jeepspeedshop This is a all new wiring harness for the Jeep JK with a LS, now we can do a GEN3 and a Gen4 engine. With a Electronic Throttle petal, we have cruise for the Gen4 but not for the Gen3 engines. Also you will need to know we build each harness one at a time. with the Gen4 engines we build them with a body control module plugs and cruise wiring RpmExtreme LS JK GEN3 DIY Conversion Harness 07-10 GM LS V8 Drive By Wire Engine Harness . This engine harness is for 2007-2011 Jeep wrangler JK when installing a GM LS GEN3 series engine 2004-2006 with Drive By Wire aka DBW Electronic Throttle Pedal. This is the bare bones that you need to install a LS GEN3 and have everything working as designed. We know it may seem like a lot of money up front but the time it will save you is well worth it.