Kohler Command PRO EFI ECH749 [129/180] Electrical system
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Kohler Command PRO EFI ECH749 [129/180] Electrical system

Kohler Command PRO EFI ECH749 [129/180] Electrical system
12924 690 01 Rev. O KohlerEngines.com
Electrical System
40/50 Amp High Output Regulated Charging System
C
E
A
D
G
F
F
F
F
B
A Battery B Starter C Kohler 60-Amp Fuse D Rectifi er-Regulator
E
Flywheel Stator
Assembly
F
4 Cooling Holes in
Flywheel
G Stator Wires
Stator
Stator is mounted on crankcase behind fl ywheel. Follow procedures in Disassembly/Inspection and Service and
Reassembly if stator replacement is necessary.
Rectifi er-Regulator
NOTE: When installing rectifi er-regulator, take note of terminal markings and install ring terminals accordingly.
Rectifi er-regulator is mounted on a bracket on top of engine or OEM installed in application. Follow procedures
in Disassembly/Inspection and Service and Reassembly or refer to your equipment manual if rectifi er-regulator
replacement is necessary.
High Output Charging Wiring Harness
In addition to main engine wiring harness (with 3 blade type automotive fuses), engines equipped with a high output
charging system will have a separate charging wiring harness with one (1) 60-amp large blade type automotive type
fuse. However, 30-amp fuse in main engine wiring harness is then nonfunctional. Purple charge wire ring terminals
in main engine wiring harness are completely sealed and retained using a special heat shrink cap for non use. No
service is required for this circuit.
Troubleshooting Guide
40/50 Amp High Output Battery Charging System
NOTE: Always zero digital volt-ohm meter (DVOM) on each scale before testing to ensure accurate readings. Voltage
test should be made with engine running at specifi c test condition noted. Battery should be checked for state
of charge (non-operating voltage 12.5 VDC or lower, battery should be charged or replaced).
When problems occur in keeping a battery fully charged or a battery charges at a high rate, battery or charging
system may be at fault. Before performing any testing, battery must be fully charged.
To test charging system:
1. Inspect charging system fuse. If damaged, replace
before continuing.
2. Visually inspect system components and wiring.
Look for damaged or loose wire connections,
including battery cables.
3. Set DVOM to DC volts, place red (positive) lead of
tester on rectifi er-regulator negative (-) post and
black (negative) lead to battery negative (-) terminal.
Run engine and observe volt reading on meter. If
voltage is 0.5 VDC or less, continue with testing. If
voltage is higher than 0.5 VDC, inspect and repair
wiring/connections as needed (insuffi cient ground).
4. Perform output tests a and b for charging system
using DVOM set to DC volts OR perform test c using
carbon pile test tool.
a. With engine off and key switch in OFF position,
measure voltage at battery. If less than 12.4 VDC,
recharge battery and retest. If 12.5 VDC continue
with tests.
b. Run engine at high speed no electrical or
mechanical load (greater than 3000 RPM). After
running 1 minute, measure voltage at battery.
i. If voltage increases to between 13-15 VDC,
system is working correctly.
ii. If voltage increases to 15.5 VDC or higher,
system is overcharging. Replace rectifi er-
regulator.
iii. If voltage stays at 12.5 VDC or decreases,
charging system is NOT operating, proceed to
step 5.

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