Main Engine Wire Harness 1970 Oldsmobile Cutlass, 442 with automatic transmission no AC. This is the harness for the back of the engine (for example the coil) and runs along the firewall. This is an M & H (part #15675) Wiring Engine Harness. Only slightly used 500 miles or so. “Like new” Condition and look and works great. asking 90.00 including free shipping. A new retail price is about $135.00.