Chevrolet S10 Engine Wiring Harness - AutoZone Order Chevrolet S10 Engine Wiring Harness online today. Free Same Day Store Pickup. Check out free battery charging and engine diagnostic testing while you are in store. Trying to wire a lt1 wiring harness to my 1996 chevy s10 Apr 15, 2010trying to wire a lt1 wiring harness to my 1996 chevy s10. i have both wiring harnesses from the s-10 and the caprice. i know that there is PAINLESS but it doesnt make sense when i have the harnesses for both help will be greatly appreciated.