C.E. Niehoff & Co. C802/C802D/C820 Troubleshooting Guides - Manual (Page 8)

Page 8
TG0004E
(CONT’D)
Section 3: Advanced Troubleshooting
Repair vehicle circuit to IGN terminal. Vehicle
charging circuit test is complete.
Set DMM to diode test. Connect black lead of DMM to B+ terminal on alternator. Connect
red lead to socket D on harness plug. DMM should read voltage drop. Reverse leads. DMM
should read OL.
Check continuity of thermal switch inside rectifier
housing assembly: Remove anti-drive end duct
housing on alternator. With DMM, check continuity
between socket D on harness plug and diode
shown in Figure 8 below. Does continuity exist?
Yes No
Yes No
Alternator is
defective.
Chart 3 – C802 – Continuation of Chart 1 or 2 as Noted
T
T
T
Thermal switch
in control unit
is defective.
T
Figure 8 – Diode Arrangement inside Anti-Drive End Housing
USE THIS DIODE
T
Figure 7 – Alternator-to-Regulator Harness Plug
SOCKET CONNECTIONS
Socket A B–
Socket B Field +
Socket C Field –
Socket D AC
Socket E B+