Change to 12 volt negative ground

[tubman]

Originally Posted by Automotive Stud

If your wiring is still original I'd just rip it out and put a new 12v universal harness in the car. Speedway has them for about $150.

If originality is of any concern to you at all, I would think twice about this solution. As a matter of fact, unless it is a full on "Hot Rod", I would carefully re-consider my original decision.