C.E. Niehoff & Co. N2013 Troubleshooting Guides - Manual (Page 3)

Page 3
TG0055A
Section C: Advanced Troubleshooting
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]
Chart 1 – No Power to System #1 or #2 with Engine Running
Before Troubleshooting, Check Batteries for Proper Charge Voltage. See Page 1.
Yes No
Go to alternator troubleshooting
guide to troubleshoot alternator
and regulator.
Disconnect battery master switches.
Check for 0.1 V diode voltage drop between System 1 terminal on isolator and alternator terminal
on isolator. Then check for 0.1 V diode voltage drop between System 2 terminal on isolator and
alternator terminal on isolator.
Does the voltage drop exist at each set of tests?
T T
Battery isolator
is defective.