88 F 250 not chargeing
88 Ford not chargeing, Ault. checks ok tryed 2 different ones. Guage on dash just come in to the good area like it reads 10 volts. Battery reads 12 volts if I jumper from battery to the white wire Ault. will full field and maintain all the lights, heater, radio, etc. Need a wire diagram to figure it all out. Any idea where I might find one?