C.E. Niehoff & Co. N1607/N1611/N3215B/N2013 Troubleshooting Guides - Manual (Page 6)

Page 6 TG56B
Section C: Advanced Troubleshooting
(CONT’D)
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 page 4 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?
 
Battery isolator
is defective.
Figure 8 – N2013 Battery Isolator
Ground bolt
Alternator connection
System #1 connection
System #2 connection