C.E. Niehoff & Co. N1128-1 Alternator w/Link or w/Wiring Harness Installation - Manual

II0084A
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N1128-1 Alternator
w/Red B+ Link or w/ Wire Assembly
Replacement Instructions
C. E. Niehoff & Co.
BRUSHLESS ALTERNATORS
For N1128-1 with serial numbers 0010 through 0059:
If red B+ link needs to be replaced (see Figure 1):
Red B+ link is no longer available as a replacement part. Install new B+ wire assembly as described below:
1. Remove ADE cover plate and save hardware for reassembly.
2. Disconnect regulator harness wiring connections from diode modules. Leave field coil F– lead connection intact
and disconnect field coil F+ lead from diode module.
3. Remove and discard red B+ link.
4. Remove and save the hardware attaching the diode module marked with an "X" in Figure 1 and the ground link
connected to it. Discard the metal thermally conductive strip between the diode module and the black heat sink
and replace with a new one. Rotate the diode module so the printed diode schematic side is on top. Reinstall the
ground link in the position shown in Figure 2 on page 2.Torque diode module mounting screws to 12.5-13.6 Nm/
9-10 lb. ft.
5. Go to "If B+ wire assembly needs to be replaced" on page 2, starting with step 4.
If diode module needs to be replaced (see Figure 1):
Red B+ link should be replaced with new B+ wire assembly when replacing any diode module.
Replace diode module and install new B+ wire assembly as described below:
1. Follow steps 1-3 in "If red B+ link needs to be replaced" above.
2. If replacing diode module marked with an "X" in Figure 1, follow step 4 in "If red B+ link needs to be replaced"
above to install the new diode module on the existing black heat sink.
If replacing one of the other two diode modules, the diode module marked with an "X" in Figure 1 must still be
changed as described in step 4, since the new B+ wire assembly will be replacing the existing B+ link. Then follow
the same steps to replace the other defective diode module, but don't rotate the new diode module.
3. Go to "If B+ wire assembly needs to be replaced" on page 2, starting with step 4.
Red B+ link
➛
Ground link
Figure 1 – N1128-1 Alternator with Red B+ Link
➛
➛ Black heat sink
Diode module
➛
Ground link
➛
➛
Black heat sink
Diode module
➛
➛
Metal
thermally
conductive
strip
➛
Ground link