Ford 2003 Mustang Workshop Manual page 3355

INCREASES VOLTAGE
Test Step
D1 CHECK I CIRCUIT 904 (LG/RD) FOR A
SHORT TO GROUND
Disconnect: Generator C102c (4.6L 4V) or
C102a (3.8L or 4.6L 2V).
Key in ON position.
With the ignition switch in the RUN position,
check the charging system warning
indicator.
Is the charging system warning indicator
illuminated?
PINPOINT TEST E: THE CHARGING SYSTEM WARNING INDICATOR
IS OFF WITH THE IGNITION SWITCH IN THE RUN POSITION AND
THE ENGINE OFF
E1 CHECK THE CHARGING SYSTEM WARNING INDICATOR
LAMP
Disconnect: Generator C102c (4.6L 4V) or C102a (3.8L or 4.6L
2V).
With the engine off, connect a fused (15A) jumper wire between
the generator C102c (4.6L 4V) or C102a (3.8L or 4.6L 2V) pin 1,
circuit 904 (LG/RD), harness side and ground.
Key in ON position.
Is the charging system warning indicator lamp illuminated?
PINPOINT TEST F: THE CHARGING SYSTEM WARNING INDICATOR
LAMP FLICKERS OR IS INTERMITTENT
F1 CHECK FOR LOOSE CONNECTIONS
Check all generator, battery, and power distribution connections
for looseness, corrosion, loose or bent terminals, or loose eyelets.
Are all connections clean and tight?
Yes
REPAIR circuit 904 (LG/RD) for a short to
ground. TEST the system for normal
operation.
No
INSTALL a new generator. REFER to
Section 414-02
normal operation.
Test Step
Test Step
Result / Action to Take
. TEST the system for
Result / Action to
Take
Yes
INSTALL a new
generator. REFER to
Section 414-02
the system for normal
operation.
No
REFER to Section
413-01 for diagnosis
and testing of the
instrument cluster.
Result / Action to
Take
Yes
GO to F2 .
No
. TEST