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GENERATOR TEST PROCEDURES ON VEHICLE INDEX page page Charging System Diagnostics (Fig. 1) . . . . . . . . . 19 Current Output Test . . . . . . . . . . . . . . . . . . . . . . 19 Output Wire Resistance Test . . . . . . . . . . . . . . . . 19 CHARGING SYSTEM DIAGNOSTICS (Fig. 1) OUTPUT WIRE RESISTANCE TEST The generator output wire resistance test shows the amount of voltage drop across the generator out- PREPARATION Before starting test, make sure the vehicle has a fully charged battery. Tests and procedures to check (1) Turn the ignition switch OFF. the generator output battery terminal (Fig. 2). (4) Connect a 0-150 ampere scale (DC) ammeter in series between B+ terminal and output wire (Fig. 2 (5) Using o-18 volt scale voltmeter, connect the positive lead to the disconnected (B+) output wire (6) Remove fresh air hose between Powertrain Control Module and air cleaner if necessary. (7) Connect jumper wire between a good ground and K20 circuit terminal at the back of the genera- CAUTION: Do not connect the A142 circuit terminal (8) Connect an engine tachometer and connect bat- tery negative cable. (10) Connect a volt/amp tester equipped with a variable carbon pile rheostat between battery termi- Caution: Be sure the carbon pile is in OFF position TEST (1) Start engine. Immediately after starting, re- duce engine speed to idle. (2) Adjust engine speed and carbon pile to main- tain 20 amperes flowing in the circuit. Observe volt- RESULTS If a higher voltage drop is shown, inspect, clean and tighten all connections between generator B+ (1) Disconnect battery negative cable. and tachometer. (3) Remove jumper wire. terminal. (5) Connect battery negative cable. Control Module and air cleaner if removed. CURRENT OUTPUT TEST The current output test decides whether the gener- ator can deliver its rated current output. For gener- identification and output amperage specifications, refer to Generator Specifications. For generator maximum voltage at individual tem- peratures, refer to Generator Output Voltage Specifi- PREPARATION Before starting any tests, make sure the vehicle has a fully charged battery. Tests and procedures to (1) Disconnect battery negative cable. (Figs. 2 and 5). (3) Connect a 0-150 ampere scale (DC) ammeter in series between the B+ terminal and output wire. (4) Using 0-18 voltmeter, connect positive lead to B+ terminal (Figs. 2 and 5). Connect negative lead Ä BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICS 8A - 19 |