Briggs & Stratton 86262GS, Familiarization & Troubleshooting Manual

Page: 60 / 128

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.
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.
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.
58
Section 3 • Generator Diagnostics and Adjustments
Portable Generator Familiarization & Troubleshooting Guide
Figure 3.3 — Check System Control Board Output