C.E. Niehoff & Co. C540 Alternator Installation - Manual (Page 2)

II176A Page 2 of 2
C. E. Niehoff & Co. • 2021 Lee Street • Evanston, IL 60202 Tech Services Hotline 800-643-4633
Figure 4 - Electrical Connections
P IGN
B+ terminal bolt –
torque to 30 Nm/22 lb. ft.
Battery output cable terminal
Washer
Lockwasher
Insulator
 



B– terminal bolt –
torque to 30 Nm/22 lb. ft.

Screws –
torque to 6.7 Nm/60 lb. in.

P and IGN
terminal nuts –
torque to
3.4 Nm/30 lb. in.
 
Field inline connection

Field
inline
connection

B+
(see
inset above)

B+ Terminal Connection
Phase terminal bolts (3 places) –
torque to 8 Nm/70 lb. in.
Cable bracket
LOC. A

Cable bracket
LOC. B

Phase
cable

Wiring Connections
1. Connect alternator phase cable into terminal
block on top of alternator:
a) Run phase cable through cable bracket
mounted in one of three locations (LOC. A, B,
or C). See Figure 4.
b) Torque screws to 9 Nm/80 lb. in. to fasten
cables to terminal block.
c) Coat terminals with Dow Corning®1-2577
Low VOC RTV coating or equivalent. Do not
use coating containing acetic acid (vinegar
smell) on electrical components.
2. Connect remaining harnesses between compo-
nents as shown in Figure 4. Use torque values
shown.
3. Choose wire gauge for B+ and B– cables capable
of handling maximum alternator output with
minimum voltage drop.
4. Connect IGN terminal on regulator to ignition
source through oil pressure switch, using #10
ring terminal. Torque #10-24 terminal nut to
3.4 Nm/30 lb. in.
5. If required, connect P terminal to tachometer or
relay, using 1/4 in. ring terminal. Torque termi-
nal nut to 3.4 Nm/30 lb.in.
Sealing Wiring Connections
1. On ALL metallic electrical connections to rectifier
(including B+ and B– connections), alternator,
regulator, and their harness connectors, apply
Dow Corning® 1-2577 Low VOC RTV coating or
equivalent. Do not use coating containing acetic
acid (vinegar smell) on electrical components.
2. At regulator harness connections, apply coating as
described in step 1, then wrap connection in
electrical tape from sleeve to sleeve.

Cable bracket
LOC. C