A 12 volt draw on battery from a one wire alternator

YOU MAY HAVE THE METER set for AC amps instead of DC, read my post below this one..........


It sounds like the rotor/ brushes have a problem. You know how to read resistance?

Put your meter switch 2 clicks to the right of "OFF" which is the "ohms" "omega" sign

Hook your probes back to the "Normal" positons, that is, the black bottom right common, and the red at top right.

Touch the two probes together and verify the meter reads "close to zero" resistance.

Now disconnect all wires from the two field connections. Measure from each field terminal to ground. You should read infinity........same as if probes are hooked to "nothing."

Next put the probes on the two field connectors, you should read a quite low reading, maybe 2-4 ohms or so.

If not, either the brushes are bad, the slip rings are dirty/ greasy/ other, or the rotor winding is bad