Charging Circuit Resistance Test

Fig. 7 Charging circuit resistance test. Models w/external regulator:

Fig. 8 Charging circuit resistance test. Models w/regulator in-engine electronics:

1. Disconnect battery ground cable and the "Bat" lead from alternator output terminal.
2. Complete test connections as shown.
3. On units with external regulator, disconnect wiring harness electrical connector from the electronic voltage regulator.
4. On units with regulator in-engine electronics, remove air hose between power module and air cleaner, then the wiring harness electrical connector.
5. On all models, connect a suitable jumper wire from wiring harness connector green wire terminal to ground. Do not connect blue J2 lead of wiring electrical connector to ground.
6. Connect battery ground cable, then start engine and operate at idle.
7. Adjust engine speed and carbon pile rheostat to obtain 20 amps in the circuit and check voltmeter reading. Reading should not exceed .5 volts. If a higher voltage drop is indicated, inspect, clean and tighten all connections in the circuit. A voltage drop test at each connection can be performed to isolate the problem.