Ford 2003 Mustang Workshop Manual page 3352

LOW
A1 CHECK BATTERY CONDITION
Carry out the Battery—Condition Test to determine if
the battery can hold a charge and is OK for use.
Refer to Section 414-01
Is the battery OK?
A2 CHECK THE GENERATOR OUTPUT
Carry out the On-Vehicle Generator Load/No Load
Test. Refer to Component Tests in this section.
Is the generator OK?
A3 CHECK FOR CURRENT DRAINS
Carry out the Battery—Drain Test. Refer to
Component Tests in this section.
Are there any excessive current drains?
A4 CHECK FOR CURRENT DRAINS WHICH SHUT OFF
WHEN THE BATTERY IS DISCONNECTED
Carry out the Battery—Electronic Drains Which Shut
Off When the Battery Cable is Disconnected Test.
Refer to Component Tests in this section.
Are there any current drains which shut off when
the battery is disconnected?
PINPOINT TEST B: THE CHARGING SYSTEM WARNING INDICATOR
IS ON WITH THE ENGINE RUNNING (THE BATTERY VOLTAGE
DOES NOT INCREASE)
B1 CHECK GENERATOR B+ CIRCUIT 38 (BK/OG)
Disconnect: Generator B+ C102b.
Measure the voltage between the generator C102b, circuit 38
(BK/OG), component side and ground.
Test Step
.
Test Step
Result / Action to Take
Yes
GO to A2 .
No
INSTALL a new battery. REFER
to Section 414-01 . TEST the
system for normal operation.
Yes
GO to A3 .
No
GO to Pinpoint Test B .
Yes
REPAIR as necessary. TEST the
system for normal operation.
No
GO to A4 .
Yes
REPAIR as necessary. TEST the
system for normal operation.
No
GO to Pinpoint Test B .
Result / Action to
Take
Yes
GO to B2
No
REPAIR the circuit.
TEST the system for
normal operation.
.