Ford 2003 Mustang Workshop Manual page 3353

Is the voltage equal to battery positive voltage (B+)?
B2 CHECK GENERATOR A CIRCUIT 36 (YE/WH)
Disconnect: Generator C102c (4.6L 4V) or C102a (3.8L or 4.6L
2V).
Measure the voltage between the generator C102c (4.6L 4V) or
C102a (3.8L or 4.6L 2V) pin 3, circuit 36 (YE/WH), harness side
and ground.
Is the voltage equal to battery positive voltage (B+)?
B3 CHECK I CIRCUIT 904 (LG/RD) FOR AN OPEN
Key in ON position.
With the ignition switch in the RUN position and the engine off,
measure the voltage 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.
Is the voltage equal to battery positive voltage (B+)?
B4 CHECK FOR VOLTAGE DROP IN B+ CIRCUIT 38 (YE/WH)
Key in START position.
With the engine at 2,000 rpm, measure the voltage drop between
the generator C102b, circuit 38 (BK/OG), component side and
positive battery terminal.
Yes
GO to B3 .
No
REPAIR the circuit.
TEST the system for
normal operation.
Yes
GO to B4 .
No
REPAIR the circuit.
TEST the system for
normal operation.
Yes
INSTALL a new
generator. REFER to
Section 414-02 .
TEST the system for
normal operation.
No