convertor question

[Dana13]

I own a 1972 Avion. When I bought it the convertor wires were cut. I fiqured out how to hook the battery up in the box outside and through a shunt in side. Some of the lights are working off just the battery. There is a blue wire, red wire and white coming out of the convertor. I hooked up the blue and red but there is nothing to hook the white up to. Since the were cut I dont know where it goes. I believe this is why some the the lights arent working. I know the white is negative but where do I wire it to? Thanks for any help.

[ticki2]

This is probably too late for you but the white wire is usually ground to the trailer, anywhere you have good connection to metal and/or frame. I'm just starting on an Avion TC.