[Dangerous Doug]

I have installed a set of PIAA lights on my 289 FIA. I've wired them correctly by PIAA instructions (pull power from a battery source, switch by relay, wire the lights to come on only with brights, et cetera).

Now, when I turn on my headlights the ammeter goes below zero, showing that the addition of the lights is drawing much more current, and my alternator cannot keep up. This is true with my driving lights off.

Now, the question: Checked Summit Racing and it seems that all of the 140 Amp alternators are "internally regulated". Is this as opposed to having a regulator box like I have in my ERA? Is an internally regulated alternator compatible with the ERA wiring? Can it be made compatible.

I am not sure what my current alternator output is, but I think it is a stock Mustang unit.

DD