Kohler Aegis ELH775 Service Manual page 56

Electrical System
Fuses
This engine has 4 blade type automotive fuses.
Replacement fuses must have same rating as blown
fuse. Use fuse chart below to determine correct fuse.
Wire Color
2 Red Wires
1 Red Wire w/Black Stripe
1 Red Wire w/White Stripe
2 Purple Wires
2 Red Wires
Fuse Replacement
1. Shut engine off and remove key.
2. Locate fuse holders.
3. Remove fuse cover and pull out fuse holder. Inspect
condition of fuse holder.
4. Inspect fuse for a solid fusible link or a broken
fusible link. Replace fuse if fusible link is broken. If
you are not sure if fusible link is broken, replace
fuse.
5. Insert fuse into fuse holder until it is seated properly.
Install fuse cover.
6. If replacement fuse fails, there is a problem within
circuit. Diagnostics are required. Identify which
circuit is aff ected (see EFI System for Wiring
Diagram) by identifying failed fuse/circuit. Perform
troubleshooting procedures appropriate for circuit
fuse that failed.
Troubleshooting Guide
25 Amp Battery Charging System
NOTE: Always zero meter on each scale before testing
to ensure accurate readings. Voltage tests
should be made with engine running at 3600
RPM - no load. Battery must be good and fully
charged.
When problems occur in keeping battery charged or
battery charges at too high a rate, problem can usually
be found somewhere in charging system or with battery.
Test Charging System for No Charge to Battery
A
B
Purple B+ Charge
A
Wire
56
Fuse Rating
10-amp Fuse
10-amp Fuse
30-amp Fuse
10-amp Fuse
Rectifi er-Regulator
B Ground Wire with 2
Eyelets
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1. With engine off , test and record battery voltage.
Voltage should be above 12 volts to proceed. With
voltmeter attached to battery, start engine. Set
engine speed to high RPM position, battery voltage
should increase (for example: 12.6 volts engine off ;
13.4 volts engine running). Actual voltage increase
will diff er depending on state of charge in battery.
2. If no voltage increase is seen at battery, turn engine
off and move voltmeter red lead to purple B+ lead on
rectifi er-regulator and black ground meter lead to
ground eyelets. Recorded battery voltage from step
1 should be seen. If battery voltage is not seen, a
blown fuse or bad connection may be at fault.
Inspect (green 30 amp) charging system fuse for
blown fuse and/or corroded fuse terminals. Inspect
rectifi er-regulator ground wire and eyelets for a
proper connection and ensure mounting screws are
secure.
3. If recorded battery voltage is seen, but no increase
while running engine, proceed to step 2 of Test
Charging System Output, for component diagnostic
testing.
4. If a slight voltage increase is seen, but system
output may be in question, proceed to step 1 of Test
Charging System Output.
Test Charging System Output
1. Perform test a or b.
a. Insert an ammeter in purple B+ lead at rectifi er-
regulator connector. With engine running at 3600
RPM and B+ (at terminal on rectifi er-regulator) to
ground using a DC voltmeter. If voltage is 13.8
volts or more, place a minimum load of 5 amps
(turn on lights if 60 watts or more, or place a 2.5
ohm, 100 watt resistor across battery terminals)
on battery to reduce voltage. Observe ammeter.
b. If a carbon pile test tool is available, temporarily
set carbon pile load near or at charging system
maximum output and observe output voltage.
(Follow tool directions for carbon pile test
procedures.)
Condition
Charge rate increases
when load is applied.
Charge rate does not
increase when load is
applied.
2. Remove connector from rectifi er-regulator. With
engine running at 3600 RPM, measure AC voltage
across stator leads using an AC voltmeter.
Condition
Voltage is 28 volts or
more.
Voltage is less than 28
volts.
Conclusion
Charging system is OK
and battery was fully
charged.
Test stator and rectifi er-
regulator (steps 2 and 3).
Conclusion
Stator is OK. Test rectifi er-
regulator.
Stator is faulty; replace.
Test stator further using an
ohmmeter (steps 3 and 4).
66 690 14 Rev. A