Hello,
I have a 69 mustang(in fact right next to me). For some reason I can get the gauges to work but not the back up lights. I have a new light switch since the rehostat goes bad from age(used a dvom also and its inconsistant on power). With this Still no luck. The dash is torn apart and I see no shorted wires what so ever. I have a new printed circuit next to me but I don't really think that is the problem since everything else works(turn signal lights work, red horse in cluster works just not cluster lights). Any idea??

Thanks pals

P/S there is a single wire(Black long and skinny with rubber around it) next to the headlight switch which is taped to the cluster of wires but i know that doesn't do anything. It is a hot wire since i tested it with a test light.