Ford 2003 Mustang Workshop Manual page 3294

PINPOINT TEST P: THE CHARGING SYSTEM WARNING INDICATOR
IS NEVER/ALWAYS ON
P1 CHECK THE CHARGING SYSTEM
CAUTION: Use the correct probe adapter(s) when
making measurements. Failure to use the correct probe
adapter(s) may damage the connector.
Check the charging system operation. Refer to
00 .
Is the charging system operating correctly?
P2 CHECK CHARGING SYSTEM WARNING INDICATOR WITH
ENGINE OFF
Key in ON position.
Observe the charging system warning indicator.
Is the charging system warning indicator on?
P3 CHECK THE INSTRUMENT CLUSTER INPUT
Key in OFF position.
Disconnect: Generator C102c.
Connect a fused (10A) jumper wire between the generator
C102c pin 1, circuit 904 (LG/RD), harness side and ground.
Key in ON position.
Does the charging system indicator illuminate?
P4 CHECK CIRCUIT 904 (LG/RD) FOR OPEN
Key in OFF position.
Disconnect: Instrument Cluster C220a .
Measure the resistance between the instrument cluster
C220a pin 5, circuit 904 (LG/RD), harness side and the
generator C102c pin 1, circuit 904 (LG/RD), harness side.
Is the resistance less than 5 ohms?
P5 CHECK THE GENERATOR
Test Step Result / Action to Take
Yes
GO to P2
No
Section 414-
REFER to
Yes
GO to P5
No
GO to P3
Yes
INSTALL a new generator.
REFER to
TEST the system for normal
operation.
No
GO to P4
Yes
GO to P7
No
REPAIR the circuit. TEST
the system for normal
operation.
.
Section 414-00 .
.
.
Section 414-02 .
.
.