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?

 

I believe there is a separate voltage regulator for your charging system. Look around on the R/S fender well for it .It may have a poor ground since they are mounted on the sheet metal and use that for its ground. Trying to locate a diagram, but in the meantime check the voltage reg and ground connection. If you solve the problem before we find a diagram , let us know.