C.E. Niehoff & Co. C612/C617/C621/C624 Troubleshooting Guides - Manual (Page 2)

Page 2 TG2D
Section A: Wiring Diagrams
B– terminal
on other side
of alternator
P terminal
Figure 3 — C612/C617/C624 Alternator Wiring Diagram
Figure 1 — C612/C617 Alternator Terminals
B+ terminal
D+ terminal
CEN C612/C617/C624 Alternators
Description and Operation
C612/C617/C624 28 V (240 A) alternators are
self-rectifying and self-energized. All windings and
current-transmitting components are non-moving,
so there are no brushes or slip rings to wear out.
BR
R
BK
G
W
B– Ground Bolt
B+ Terminal
D+ Terminal
R or P Terminal
 


When controlled by the A2-141 regulator, these alterna-
tors become self-energizing through internal diode
trios. Residual magnetic field induces small voltage in
stator and energizes field coil. Field coil continues
receiving incremental voltage until full voltage is
achieved. AC is rectified into DC output through diodes.
Regulator controls voltage output. Regulator has:
• D+ terminal to provide a signal to vehicle electrical
system, confirming alternator operation
• P terminal to provide an optional AC voltage tap.
Figure 2 — C624 Alternator Terminals