[Hans-Olof Blom]

Rick,

You are recommending a minimum of 100 Amps for the alternator and that 140 Amps would be lot better. Then you write that you are using a 70 Amps alternator?

I am using an MSD Digital-6 unit with a current draw of 0,7 Amps/1000rpm. The numbers for the MSD units are from MSD's specification. I assume that they know what they manufacture and sell. A minimum of 5 Amps is probably what is needed to be able to drive the car.

I have a standard 65 Amps Ford alternator which is what ERA recommends. I have no problems with the electrical system. Yes, the Amp-meter goes negative when my 3 cooling fans kicks in at idle. But that is one reason why I have a battery in the car.