Prickly Bobby, are you referring to the tow harness wiring or the interior wiring or both??
4500 wiring (I have a 1978 Trillium
4500) is basically the same as Scamp
wiring and its very simple. For interior wiring, black = positive and white = negative. The original "power center" simply has a push button AC circuit breaker and push button DC circuit breaker on the front panel. Also on the power center front panel is a switch for toggling between battery
power, shore power and OFF.