C.E. Niehoff & Co. C510/C540 Troubleshooting Guides User Manual
Page 7
With engine running: Does battery voltage exist at rectifier
B+ terminal and regulator E or IGN terminal?
Yes
No
Page 7
TG1B
Section D: Advanced Troubleshooting
(CONT’D)
Test for battery voltage at B+ terminal on rectifier. Does battery voltage exist?
Yes
No
Repair vehicle wiring as
necessary. Continue test.
Vehicle charging circuit
test is complete. Run
engine and re-test
charging circuit for
operation.
Chart 3 – No Alternator Output – Test Charging Circuit
Jumper B+ terminal on rectifier to E or IGN
terminal on regulator.
Yes
No
STATIC TEST – ENGINE OFF, BATTERY SWITCH ON, KEY ON
Repair vehicle ignition
circuit.
Figure 3 – Rectifi er-to-Regulator Harness Plug
SOCKET CONNECTIONS
Socket A B–
Socket B Not Used
Socket C Field –
Socket D Phase AC
Socket E B+
Unplug rectifier-to-regulator harness. Plug CEN Regulator Bypass Adapter A10-129 into harness plug
and momentarily (1 second) touch black lead to ground on alternator case. (If no Adapter is available,
connect jumper wire from pin C on the harness to ground). Spark will occur at ground. Touch steel tool
to shaft to detect significant magnetism. Is shaft magnetized?
Disconnect Regulator Bypass Adapter or jumper
wire. Connect DMM red lead to socket E in
rectifier-to-regulator plug. Connect black lead
to socket A in same plug. Does battery voltage
exist?
Regulator is
defective.
Yes
No
Yes
No
Unplug inline field connector. Check resistance
across two sockets on alternator side
of connector.
Does resistance measure 0.9 to 1.1 ohms?
Yes
No
Check resistance across
F+ and F– terminals on
alternator.
Does resistance measure
0.9 to 1.1 ohms?
Yes
No
Wiring
harness is
defective.
Alternator
is
defective.
If you have questions about your alternator or any of these test procedures, or if you need to locate a Factory Authorized Service Dealer, please contact us at:
C. E. Niehoff & Co.• 2021 Lee Street • Evanston, IL 60202 USA
TEL: 800.643.4633 USA and Canada • TEL: 847.866.6030 outside USA and Canada • FAX: 847.492.1242
E-mail us at [email protected]
Test for charge voltage at B+ terminal on rectifier.
Does charge voltage exist?
Yes
No
Test for charge voltage at B+ terminal on rectifier.
Does charge voltage exist?
Shut off engine.
Rectifier is
defective.