Non-Trouble Code Procedures

Fig. 1 Charging Circuit Resistance Test:

1. Disconnect battery ground cable and the "Bat" lead from alternator output terminal.
2. Complete test connections as shown.
3. Remove air hose between engine controller and air cleaner.
4. On non-turbo models, connect a suitable jumper wire from green (R3) terminal to ground. Do not connect blue J2 circuit to ground. On turbo models, connect a suitable jumper wire from green R3 lead wire on dash side of black 8 way connector to ground. Do not connect blue J2 lead of 8 way wiring connector to ground.
5. On all models, connect battery ground cable, then start engine and operate at idle.
6. Adjust engine speed and carbon pile rheostat to obtain 20 amps in the circuit, then 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.