TM 5-3805-258-24-2
ENGINE
TESTING
Positive Diode Check
Connect ohmmeter between each rectifier solder
phase terminal (9) and the (B+) terminal (12).
EXCITATION DIODE CHECK
(Inside View)
9. Bridge rectifier terminals. 13. To the (D+) terminal (14).
POSITIVE DIODE CHECK
(Inside View)
9. Bridge rectifier terminals. 10. To the (B+) terminal (12).
EXCITATION DIODE CHECK
(Outside View)
11. To the bridge rectifier terminals. 14. (D+) terminal.
REGULATOR TEST
Precautions
POSITIVE DIODE CHECK
(Outside View)
11. To the bridge rectifier terminals (9). 12. (B+) terminal.
Excitation Diode Check
Connect ohmmeter between each rectifier solder
phase terminal (9) and the D+ terminal (14).
Do not recharge battery during tests. Generator
must not be in operation (rotating) when the regula-
tor is connected and disconnected. Alternator and
voltmeter must each be connected in parallel
(across) with the battery.
Disconnect the battery from the generator only when
the generator is not in rotation. Do not operate the
alternator without the battery.
Test Conditions and Connections
Regulator and generator cold [approximately 20° C
(68° F)]. Carbon pile is connected in parallel with
the battery.
5-12i
