Page 6
TG3E
Section C: Advanced Troubleshooting
(CONT’D)
Chart 2 – No Air-Conditioning/Alternator Warning Light On
Yes
No
Connect DMM red lead to D+ (or P) terminal on regulator. Connect black lead
to alternator B– terminal.
At D+ terminal – is regulator setpoint voltage present?
At P terminal – is 12 V to 18 V present?
Stop engine. Alternator is good.
Check vehicle wiring.
Yes
No
Stop engine. Unplug alternator-to-regulator harness. Set DMM to Diode Test.
Connect DMM red lead to socket D on alternator-to-regulator harness plug.
Connect black lead to alternator B+ terminal. Does continuity exist?
Regulator is defective.
Go to Chart 4, page 8.
Yes
No
With engine running, verify operation of charging system. Is regulator setpoint voltage present?
Go to Chart 3, page 7.
Figure 4 – Alternator-to-Regulator Harness Plug
SOCKET CONNECTIONS
Socket A B–
Socket B Field +
Socket C Field –
Socket D AC
Socket E B+
R
Section 3: Advanced Troubleshooting (cont.)
Page 6
TG3F
