C.E. Niehoff & Co. A2-321/A2-322 Regulator with Extended Harness Troubleshooting Guides - Manual

TG0038A
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A2-321 and A2-322 Regulators
w/Extended Wiring Harness
Troubleshooting Procedures
C. E. Niehoff & Co.
BRUSHLESS ALTERNATORS
To troubleshoot the A2-321 or A2-322 regulators with extended wiring harness (see Figure 1 or 2):
1. Make sure all connections follow Figure 1 or 2 for appropriate harness.
2. A2-321 only: In 6-pin harness connectors, make sure pin A is lined up with notch on connector. See Figure 2.
2. Check condition of fuse(s). Replace if necessary.
3. Disconnect extended harness from the alternator harness, regulator connector, 2-pin connection to vehicle, and two
wires from regulator.
Ensure extended harness is completely disconnected from alternator, regulator, and vehicle harness to
prevent accidental connection and shorts, damaging components.
Use a DMM set on continuity check or diode test to check the continuity of all end-to-end connections, including
2-pin connector.
4. If necessary, connect regulator directly to alternator-to-regulator harness to verify operation without extended
harness. Jumper vehicle harness as indicated by manufacturer.
Mating connector included
with harness
➛
Harness includes 20 A slow-blow
fuse (Bussman MDA20 or equiv.)
➛
➛
Orange wire from REG/IGN source to pin A
in 2-pin connector
Red wire to NO-CHARGE input into pin B in 2-pin
connector
White wire from pin B
(D+ Multiplex input)
in 2-pin connector
to D+ terminal on regulator—
torque to 3.4 Nm/30 lb. in. Green wire from
pin A (IGN source)
in 2-pin connector
to IGN terminal on regulator—
torque to 3.4 Nm/30 lb. in.
➛ ➛
Approx. 72 in. or 80 in.
4 places—1/4-20 screws and
lockwashers (provided)
torque to 8.5 Nm/75 lb. in.
➛
4 places—#10-32 screws
torque to 8.5 Nm/75 lb. in.
➛
Figure 1 – A2-322 Regulator Remote Mount with Extended Alternator Wiring Harness
➛ P terminal on
regulator is not
used in Gillig
applications
Diagnostic LED
➛
C701/C701A
Alternator-to-Regulator
Harness Plug
CONNECTIONS
A B–
B F+
C F–
D Phase (AC)
E B+
я
я
я
я
я
CAUTION