Mustang GT V8-4.6L SOHC VIN X (1998)
1. Insert the test leads in the input terminals shown.
2. Disconnect the battery terminal and touch the probes.
3. Isolate the circuit causing the current drain by pulling out one fuse after another while reading the display.
5. Current reading will drop when the fuse on the bad circuit is pulled.
6. Reinstall fuse and test components (including connectors) of that circuit to find damaged component(s).
NOTE: Do not start vehicle with clip on cable. The current reading (current drain) should be less than 0.05 amp. If it exceeds 0.05 amp, it
indicates a constant current drain which could cause a discharged battery. Possible sources of current drain are vehicle lamps (engine
compartment, glove compartment, luggage compartment, etc.) that do not shut off properly.
Drains Which Shut Off W/Battery Cable Disconnected
ELECTRONIC DRAINS WHICH SHUT OFF WHEN THE BATTERY CABLE IS DISCONNECTED
1. Repeat Steps 1 through 6 of the voltmeter drain testing.
2. Without starting engine, turn ignition switch to RUN for a moment and then OFF. It applicable, wait one minute for the illuminated entry lamps to
turn off.
3. Connect the voltmeter and read the voltage. The current reading (current drain) should be less than 0.05 amp. If it exceeds 0.05 amp after a few
minutes, and if this drain did not show in previous tests, the drain is most likely caused by a malfunctioning electronic component. As in previous
tests, remove the fuses in fuse junction panel one at a time to locate the problem circuit.
On-Vehicle Tests
Troubleshooting or diagnosis is required before actual service can be made in the electrical system. Even where an obvious condition makes replacement
of a component necessary, find out why the component failed. When a condition is diagnosed correctly, unnecessary service is prevented, the time the
vehicle is out of service will be decreased and the condition will be properly corrected the first time.
NOTE: Refer to the Rotunda Alternator, Regulator, Battery and Starter Tester 010-00725 (ARBST) or equivalent Test Procedure Manual for complete
directions on checking out the charging system.
