Engine Wiring Harness.. | For Plymouth Road Runners Only I would suggest you look up the FSM here on the site and check the wiring diagram for those wires. I'm sure there is a was to modify your system but I'm not sure how to do it. When I switched my car over to an electronics system I used Pertronics which was an easy install with no modifications needed to the wiring harness.Back of Dash Wiring routing | For Plymouth Road RunnersUnder dash wiring harness. | For Plymouth Road RunnersWhich wiring harness brackets? | For Plymouth Road Runners68 dash harness | For Plymouth Road Runners Only ForumsSee more results 1969 Plymouth Road Runner Parts | Electrical and Wiring 1969 Plymouth Road Runner Parts - Wiring & Connectors Classic Industries offers a wide selection of Wiring & Connectors for your 1969 Plymouth Road Runner. Classic Industries offers 1969 Plymouth Road Runner Connectors, 1969 Plymouth Road Runner Harnesses, 1969 Plymouth Road Runner Insulation, and 1969 Plymouth Road Runner Wiring. 1968 - 1970 Chrysler B-Body RestoMod Wiring System Harness is laid out and formed to allow for nearly all after market accessories such as gauge packages, wiper systems, heat and air-conditioning systems, etc. Many original switch connector bodies! Steering column connectors can plug directly into most aftermarket steering columns or stock ‘68-‘70 Mopar columns using the adapter and terminals included in the kit.