Flywheel Alternator - Onan T260G Service Manual

FLYWHEEL ALTERNATOR
This unit is equipped with a permanent magnet flywheel
a l t e r n a t o r and solid-state voltage regulator-rectifier
,output control). See Figure 9. As with all solid-state
electrical units, precautions are necessary when serv-
icing. Observe the following:
This engine uses a 12 volt, negative
CAUTION
-
ground system. Alternator must be
connected to battery at all times when engine is
running. Do not reverse battery cables.
Weak ignition spark or a discharged battery indicates
trouble in the charging system. But before testing the
engine's charging system, always check the battery for
serviceability.
Keep these points in mind when testing or servicing the
flywheel alternator:
CAUTION
1.
Be sure engine is being run long enough and fast
enough to recharge battery after each start. Charging
system tests require a full charged battery. Alternator
output is reduced in direct proportion to engine rpm.
Also, power required for accessories reduces power
available to recharge battery.
2.
3.
4.
5.
6.
The regulator-rectifier has built in protection against
open circuits or short circuits on the alternator
output (B+) terminal. Either condition will cause the
regulator-rectifier to shut off and appear as if it is not
functioning Prior to checking the regulator-rectifier,
check all wiring between the regulator-rectifier B+
terminal and the battery positive terminal to
assure it is free of open circuits, resistances or short
circuits. Also, if the battery is extremely discharged
it may have insufficient power to "turn on" the
regulator-rectifier.
Be sure regulator-rectifier plug (connector) is
inserted properly. Plug must bottom in receptacle;
this eliminates any resistance due to a poor
connection. Keep clean and tight.
Make sure alternator stator leads are not shorted
together.
Be sure regulator-rectifier has a good ground
connection. Mating surface for mounting must be
clean and fasteners tightened properly.
Never reverse the battery leads.
STARTER
IGNITION)
B+
FLYWHEEL
VOLTAGE REGULATOR
ES-1333
MOUNTED ON
CYLINDER COVER
--
MOUNTED BEHIND
BLOWER WHEEL
TO BATTERY
REGULATOR MUST BE GROUNDED
CAUTION:
THROUGH MOUNTING BOLTS
ES-1332
VOLTAGE REGULATOR
CONNECTIONS
.___-_-
FIGURE 9. FLYWHEEL ALTERNATOR SYSTEM