S-10 V8 (LS, LT) Custom Wiring - CPW | LSX Harness | LSX S-10 V8 (LS, LT) Custom Wiring. Be sure to check out our S-10 V8 swap parts and our custom direct-fit wiring harnesses for S-10’s and our stand alone wiring harnesses for S10’s. The S-10 trucks are a very popular vehicle for engine swaps of all kinds. Since our specialty is with these trucks, there are many variations offered to install a Painless Wiring Official Site of Painless Performance, American Made wiring harnesses for your hot rod, street rod, muscle car, off-road and everything in between. Wire it once and wire it right with Painless.