Charging Circuit Resistance
NOTE:
Before making test connections, disconnect battery ground cable at battery negative post to avoid accidental shorting of charging or field circuits.
- Disconnect "BAT" lead at alternator and connect a 0-100 ampere scale D.C. ammeter in series between alternator "BAT" terminal and disconnected "BAT" lead. Connect positive lead of D.C. voltmeter to disconnected "BAT" lead and connect negative voltmeter lead to battery positive terminal. Disconnect field lead from alternator, then connect a jumper lead from alternator field terminal to ground. Connect a tachometer, then connect battery ground cable. Connect a variable carbon pile to battery terminals.
- Start engine and operate at idle.CAUTION: To avoid damage, reduce engine speed to idle immediately after starting.
Adjust engine speed and carbon pile to obtain 20 amperes flowing in circuit. Voltmeter reading should not exceed 0.7 volts. If a higher voltage drop is indicated, inspect, clean and tighten all connections in charging circuit.
NOTE: If necessary, test voltage drop at each connection to locate connection with excessive resistance.