Briggs & Stratton 86262GS Familiarization & Troubleshooting Manual page 60

Test 4:
— Check System Control Board Output
Measure the (DC) voltage across the two BLK wires on the
system control board.These wires go to the idle control coil
(Figure 3.3). Leave this connector plugged in while measuring
voltage output.
Figure 3.3 — Check System Control Board Output
Approximately 120VDC should be measured with the idle
control switch turned ON and the generator running with
no load applied.
If 120VDC is present:
The system control board is working.
If 120VDC is not present at the BLK wires, but
120VAC is present on the BLU/WHT and GRN wires
(Figure 3.2) with the idle control switch ON:
The system control board is bad.
• Check the idle control coil for shorts.
NOTE:
A shorted coil can damage the system
control board. Be sure to adjust the voltage
potentiometer when replacing the system control
board.
Portable Generator Familiarization & Troubleshooting Guide
Section 3 • Generator Diagnostics and Adjustments
Test 5
— Check Idle Control Coil
Remove the five pin connector from the system control
board. Measure the resistance across the two BLK wires.
Approximately 1500 ohms should be measured. Also,
measure between the BLK wires and ground. A reading of
infinity should be measured. Any other reading indicates a
bad idle control coil.
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