The Ford Barn - View Single Post - Advice to change 6 volt to 12 volt Model A

kenparker · 07-09-2010, 07:47 AM

12 volt negative altrnator. and dont forget the smaller diameter pulley. You will need a 30 amp amp gauge (less likely to burn out with the initial voltage surge when the 12 volt alt kick in). You will need a coil with internal rieister or add a 12 to 6 volt resistor. You will need one of the horn resistors that the vendors sell (the 12 volt will ruin the horn - ask me how I know. Change all bulbs. Your starter will be fine as a 6 volt starter. The down side is the intiial jolt of the 12 volts will eventually break the bendix bolts or the spring.

07-09-2010, 07:47 AM	#2
kenparker Senior Member Join Date: May 2010 Location: Van, Texas Posts: 1,122	Re: Advice to change 6 volt to 12 volt Model A 12 volt negative altrnator. and dont forget the smaller diameter pulley. You will need a 30 amp amp gauge (less likely to burn out with the initial voltage surge when the 12 volt alt kick in). You will need a coil with internal rieister or add a 12 to 6 volt resistor. You will need one of the horn resistors that the vendors sell (the 12 volt will ruin the horn - ask me how I know. Change all bulbs. Your starter will be fine as a 6 volt starter. The down side is the intiial jolt of the 12 volts will eventually break the bendix bolts or the spring.