Kohler 40COZ/33CFOZ Service Manual page 81

Voltage Regulator Test
1. Close the safeguard breaker, if equipped.
2. Disconnect the wiring harness connector from the
voltage regulator and check for continuity between
the voltage sensing leads V7 and V8 (pins 4 and
10). See Figure 7-11. If the circuit between V7 and
V8 is open, repair or replace it. An open circuit
normally results in a high voltage or overvoltage
condition.
3. Check the 15-amp fuse, if equipped.
4. If continuity exists between V7 and V8, check for
continuity in the voltage adjustment circuit (leads
67 and 68). Disconnect the voltage regulator
harness plug and check for resistance between
pins 1 and 3. Measured resistance should change
as the voltage adjust rheostat is turned. Repair or
replace inoperative components as necessary.
Note: An inoperative voltage adjust rheostat
usually results in a nonadjustable voltage.
5. Check the 15-amp fuse, if equipped, inside the
controller. If this circuit is open, repair or replace
the inoperative components and/or wiring.
6. Check for battery voltage at the voltage regulator
harness plug (pins 2 and 11) with the generator set
running. If there is no battery voltage between pins
2 and 11, check the safeguard circuit breaker.
Note: Lack of battery voltage to the voltage
regulator usually results in very low voltage
at the main output leads.
7. While the generator set is running, check for
approximately 1--2 volts DC output between
terminals 3B (+) and 5B (--) on the LED board or
disconnect the 3B/5B connector at the LED board
and check for 8 volts DC (approximately) at the
connector. If there is no DC voltage output present
between 3B and 5B, check for an open or short
circuit in the wiring back to the voltage regulator. If a
fault exists in the voltage regulator wiring, repair or
replace as necessary. If the voltage regulator
wiring appears functional, replace the voltage
regulator.
Note: Low or no voltage at the LED circuit board
may cause a low output voltage fault.
TP-5737 5/01
1
2
1. AVR board in junction box
2. Controller terminal strip
Figure 7-11 AVR and Connections
Section 7 Component Testing and Adjustment
3-101
R8371-3
A-328917-X
67