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. 1979-1993 Mustang Electrical & Wiring - CJ Pony Parts Electrical & Wiring. The Fox Body Mustang relies on its electrical system to operate at peak performance. If you haven’t addressed your Fox Body’s wiring since it rolled out of the factory, it’s time to upgrade. CJ Pony Parts is your source for Fox Body wiring harnesses and other products.