C.E. Niehoff & Co. N1617/N3264/N2013 Troubleshooting Guides - Manual (Page 4)

Page 4 TG82A
Section B: On-vehicle Troubleshooting
Tools and Equipment for Testing
• Digital Multimeter (DMM)
• Ammeter (digital, inductive)
Perform on-vehicle troubleshooting
before attempting on-bench tests
or static tests.
NOTICE
Chart 1: No Power to Main Battery Bank (STRT) or Aux. Battery Bank (AUX) with Engine Running
Before Troubleshooting, Check Batteries for Proper Charge Voltage. See Page 1.
Yes No
Go to Chart 2 on page 5 to
troubleshoot alternator.
Disconnect battery master switches.
Set DMM to diode test. Connect DMM red lead to STRT terminal on isolator. Connect black lead to
ALT terminal on isolator. DMM should read blocking in this direction. Then reverse leads. DMM
should read flow in this direction. Repeat for AUX and ALT terminals. Tests should read flow in one
direction and blocking in the other direction. Did readings pass the tests?
Battery isolator
is defective.
Figure 6 – N2013 Battery Isolator
Ground bolt
ALT connection
STRT connection
AUX connection