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ADVANCED SYSTEM TROUBLESHOOTING
NO ALTERNATOR OUTPUT
STATIC TEST -
ENGINE OFF, KEY ON, BATTERY SWITCH ON.
Identify and locate "B+", "E", and "R" and ground ("B-")
terminals on alternator and check for link from terminal
"R" to "E".
GO TO ALTERNATOR
Test for battery B+ voltage (__________V)
at "B+" terminal on alternator:
If there is no B+ voltage on "B+" terminal,
repair VEHICLE wiring as necessary.
Continue test.
• If B+ voltage is present on "B+" terminal,
continue test.
Remove strap between "R" and "E" terminal.
Connect a 12 gauge jumper wire from the "B+" terminal
on alternator to the "E" terminal on alternator.
M13002 2/99
24V/220A Self Energized
DAMAGE WILL OCCUR IF UNIT IS OPERATED
WITH STRAP CONNECTED AND B+ APPLIED!
• If there is magnetic attraction alternator is
NOTE: Alternator may not be turned on when engine
is operating. Go to "R" terminal test next, to prove if
vehicle "E" circuit will turn alternator on.
24VDC Electric Supply System
with 220 Amp. Niehoff Alternator
Hold a steel wrench or screwdriver near alternator
drive pulley: wrench or screwdriver held near
drive pulley will be attracted to pulley by magnet-
ism.
If there is no magnetic attraction, alternator
may not be turned on. Go to "Regulator Test"
that follows and continue test.
good and regulator should be considered
good.
Alternator will produce electricity because regula-
tor is on. This test only shows regulator as either
on or off.
M13-9
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Table of Contents
Troubleshooting
