C.E. Niehoff & Co. 200, 300 User Manual

Series 200 & 300 Alternators
Voltage Regulator Upgrade
Installation Instructions
This symbol is used to indicate special instructions
NOTICE
on installation, operation or maintenance that are important but not related to personal injury hazards.
300 Series – A1-300, A1-301, A1-302, A1-303, A1-305, A1-306, A1-307
N1101, N1102, N1103, N1108, N1111, N1112, N1114, N1115, N1117, N1118, N1119, N1120, N1121, N1122, N3017, N3018,
N3037, N3038
1. No modification to cover assembly is needed.
2. New voltage regulator circuit board fits in place of old one as shown in Figure 1.
3. Wire as shown in Figure 2.
A1-305 and N1114 may have an additional brown lead
(see Figure 1) not required for new regulator. Trim lead and tape exposed end to insulate from contact with other components.
Voltage Select Switch Position
A2-431 Reg. A2-432 Reg. A2-433 Reg. Position 1—13.8 V Position 1—27.6 V Position 1—27.6 V Position 2—14.2 V Position 2—28.0 V Position 2—28.5 V Position 3—14.6 V Position 3—28.5 V Position 3—37.2 V Position 4—14.6 V Position 4—29.0 V Position 4—38.3 V
Brown Lead not needed
for new regulator
Figure 1 - Series 300 Circuit Board
Field Lead
(white wire with ring terminal)
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“B-” Lead
(heavy black wire)
Field lead white wire with ag
NOTICE
terminal must be attached to heat sink stand-off. There is no terminal on new board for
eld lead with fl ag terminal.
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200 Series – A1-200, A1-201, A1-202 N1025, N1026, N1031, N1036, N1037, N1077, N1079,
N1080, N1085, N3036, N7024, N7031, N7040
1. Remove end housing assembly, voltage adjust-
ment cover, screw, and voltage adjustor insula­tor.
2. Using the third hole as the pilot hole, drill a
9/16” hole.
3. Deburr new hole to prevent damaging new
switch on new circuit board.
4. Install new circuit board and wire per
Figure 4.
Voltage Select Switch Position A2-434 Reg. A2-435 Reg. Position 1—13.8 V Position 1—27.6 V Position 2—14.2 V Position 2—28.0 V Position 3—14.6 V Position 3—28.5 V Position 4—14.6 V Position 4—29.0 V
Figure 3 - Series 200 Cover Assembly
“R” Lead
(brown wire)
“Y” Lead
(brown wire)
Field Lead
(white wire)
Output Lead
(red wire)
GROUND
(white wire)
C. E. Niehoff & Co. • 2021 Lee Street • Evanston, IL 60202 Tech Services Hotline 800-643-4633
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