C.E. Niehoff & Co. N1241-1 Troubleshooting Guides - Manual (Page 2)

Page 2
TG0043B
Section 1: Wiring Diagram
CEN N1241-1 Dual Voltage
Alternator Description and Operation
N1241-1 150 A (28 /14 V) dual voltage alternators
are internally rectified. All windings and current-
transmitting components are non-moving, so there
are no brushes or slip rings to wear out. Energize
switch (commonly an oil pressure switch) activates
regulator. Field coil is then energized. Upper voltage
(28 V) is rectified with standard diodes. Lower
voltage (14V) circuit output current is controlled by
SCRs in the drive end housing. Alternator output
current is self-limiting and will not exceed rated
capacity of alternator.
N3208 regulator used with alternator:
• maintains alternator output voltage at regulated
settings as vehicle electrical loads are switched
on and off.
• maintains equal voltage across battery terminals
of series-connected batteries.
B– Terminal
Figure 2 — N1241-1 Alternator with Regulator
Figure 1 — N1241-1 Alternator and N3208 Regulator
Terminals
14 V B+
terminal
28 V B+
terminal
T T T T T
T T T T T T T T T T
14 V System
LED Indicator
T T T T T
28 V System
LED Indicator
T T T T T
E
E terminal
T TT T T T T T T T
R terminal
R
14V
28V