Mustang V6-232 3.8L VIN 3 TBI (1984)
Battery: All Technical Service Bulletins
Battery - Discharging Due to Component Current Drain
Article No. 84-15-9
BATTERY - MAINTENANCE-FREE - DISCHARGED DUE TO COMPONENT CURRENT DRAIN - DIAGNOSTIC PROCEDURE
FORD ALL WITH MAINTENANCE-FREE BATTERY
LINCOLN-MERCURY ALL WITH MAINTENANCE-FREE BATTERY
LIGHT TRUCKS ALL WITH MAINTENANCE-FREE BATTERY
Discharged maintenance-free batteries could be caused by the following:
1.
Glove box, hood, trunk, or courtesy lights staying on because of misaligned or faulty switches.
2.
Cooling fan relays, antenna motors and other energized components remain on.
3.
Pinched or grounded wire harness.
To determine whether a constant current drain condition exists, it is necessary to perform the following test:
Constant Current Drain Test (Non-Message Center Equipped Vehicles)
Use a regular 12-volt test light for this test:
1.
Be sure all vehicle electrical circuits are turned OFF. To check for minimum battery charge and/or condition of bulb, connect test lamp across
battery terminals. Lamp should light. Disconnect test lamp.
Figure 13
2.
Disconnect either positive or negative battery cable. Connect 12-volt test light between cable terminal and battery post (Figure 13).
3.
If light glows, reconnect terminal to post for 5 seconds then repeat to ensure results.
Test Conclusions
^
Light Does Not Glow - No current drain.
^
Light Does Glow - Check individual circuits to locate cause of current drain. Underhood lamp, luggage compartment lamp, glove box lamp,
reading or vanity mirror lamps are prime suspects.
Constant Current Drain Test (Message Center Equipped Vehicles)
