Buick Wire Harness - DiecastMusclecars Com Factory Correct Wiring Harnesses. Made by Lectric Limited right here in the USA!. We specialize in 1970 - 1972 Buick's but we can accommodate all years! If you don't see your year or model please call us. We'll beat our competitors prices!! Buick Engine Wiring Harness - PartsGeek A fully functioning Engine Wiring Harness will ensure error-free operation of the car or truck's electricity-related systems. An Engine Wiring Harness, also referred to as a wiring loom, is a collection of cables or wires that send out energy through a car's electrical system.