Had a chance to go over the batteries today, clean them and the connections and then coat them. After a full charge and 24 hours they are all about 6.85v.
Had a good look at the rear lights and see three wires coming out of them...brakes?
Going to take them and the front lights apart this week and prob wire from scratch. Looking at the wiring that is disconnected under the seat and tracing with a continuity tester I cannot make much heads or tails.
QUESTION: Are the lights on these systems usually 12v or 6v for one of my age (1991). Looking how they may have rigged it (terminals to nowhere) I suspected it was 6v even knowing I was expecting 12v.