[chris vickery]

I recently had an electrical issue with my 1970 CDN3.
I had no RH turn sig front or back. As I dove into it further I ended up with no sigs at all. It turned out to be two issues working with each other, like an electrical gang fight...
What I discovered after indepth diagnostics was that
1) the RH front sig wire was going to ground because of old insulation (shorting)
2) the sigs problems began in the turn signal switch. A NOS replacement cured the problem. These use a solid state board that was cooked.
As much as electrical issues are a headache, if you start with the basic and work from there it is usually not too hard to pin point the issue.
Break it down to individual components and circuits. A multi check on bulbs for continuity to ensure operating condition. A check on the circuit from point A to point B for continuity. Check your switch for operation on the high and low to ground. Check for connections being the correct ones as previously mentioned. NOS or new components are often times defective right from new.