ADVANCED SYSTEM TROUBLESHOOTING
24V/220A Self Energized
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.
DAMAGE WILL OCCUR IF UNIT IS OPERATED
WITH STRAP CONNECTED AND B+ APPLIED!
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.
• If there is magnetic attraction alternator is
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.
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.
M13002 2/99 24VDC Electric Supply System M13-9
with 220 Amp. Niehoff Alternator
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