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Field Coil Draw

Connect positive lead of test ammeter to positive terminal of fully charged battery. Connect a jumper wire to negative terminal of battery, and ground it to alternator end shield.

Connect test ammeter negative lead to field terminal of alternator. Slowly rotate alternator rotor by hand and note ammeter reading. Coil draw should be 2.3 amps to 2.7 amps at 12 volts.

NOTE: A low coil draw is an indication of high resistance in field coil circuit (brushes, slip rings, or rotor coil). A higher rotor coil draw indicates a possible shorted coil or a grounded rotor.
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