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Old 11-14-2019, 10:40 AM   #9
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Join Date: Dec 2017
Location: Guthrie, OK
Posts: 528
Default Re: Driving at night - Charge and Ammeter Readin

Ford never authorized 50 CP headlight bulbs for the A because with the draw of the rest of the system they exceed the design capacity of the generator.

The location of the ammeter in the circuit means it measures only battery current, assuming it's wired per FSB 11/29, with coil connected to the generator side of the ammeter.

If it is wired per the original drawing, it reads generator current charging the battery, plus coil current draw. When the cutout is open (idle) it shows battery discharge to the lights, but not the coil.

Needless to say, the ammeter does not indicate total generator output; the lighting circuit is a separate loop.

Hope this helps your understanding.
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