There are two wires coming into the battery junction block(not counting feed from pos. battery) located behind the battery on my 71 and the assembly manual shows a fuseable link on the black 20 gauge wire that I believe is lighting related but it does not list a rating! I was thinking about putting in a 20 amp breaker like I use on my trailer for the electric brakes but I am not sure if 20A is to big. Does anyone know what the factory rating for this black wire was? Thanks!