I'm tearing into the wiring on our "new" '66 COmpact to get the original lights to work. The original lighting isn't even connected anymore, from what I can tell.
So I really have 2 questions.
1. Does the wiring for the original lights (2 tail and 2 running) just run under the trailer? I see 3 wires poking out from the rear of the trailer that were cut. I assume if I reconnect them I'll be closer to having those lights working again.
2. Grounds. Where are the lights grounded, through the body? Which then grounds to the chassis?
I believe grounds are the biggest issue I'm facing during testing, so surprise as it's the same with old Italian cars too.
So far I've just cleaned up all the connections, put on a few new connectors, and the lights are working. A good ground on the frame is a must. If your skin is connected to the frame you'll be fine.
I just replaced the running lights this weekend, but basically just cut the old wire and crimped on the new light. I haven't tested it yet as I'm still working on the tail lights, but I'll try to get photos next time I'm out there.