Briggs & Stratton 86262GS Familiarization & Troubleshooting Manual page 59

Portable Generator Familiarization & Troubleshooting Guide
Section 3 • Generator Diagnostics and Adjustments
XL&MC Generators, 3500-7500 Watt
Refer to Figure 3.1.
Test 1:
— Check (AC) Frequency and Voltage
Connect an accurate (AC) frequency meter across the two
parallel blades of one of the panel 120VAC receptacles.
• Start the engine and let it stabilize.
Read the (AC) frequency. A frequency reading of
61-63 Hertz should be obtained.
With the generator engine running:
• Connect the VOM test probes across the parallel blades
of one 120VAC receptacle. A reading of approximately
122-124VAC should be indicated.
If voltage checks as specified:
• Discontinue test.
Test 2:
— Check If Idle Control Coil Is Magnetized
With the generator running, no electrical load on the
generator, and the idle control switch ON, the idle control
coil is energized and becomes an electromagnet.Touch the
shaft of a screwdriver to the idle control coil. If the solenoid
is energized, the screwdriver should stick to the side of the
coil. If the screwdriver sticks but the engine does not go to
"low idle:"
• The idle control needs adjustment. (See Page 66)
Test 3:
— Check System Control Board Input
Measure the (AC) input to the system control board across
the BLU/WHT tracer wire, (located by the idle control
switch) and GRN wire (located on the locking outlet
mounting tab).With the idle control switch is ON and the
generator running (Figure 3.2), 120VAC should be measured.
Figure 3.2 — Check System Control Board Input
If voltage is not present:
• Check for (AC) output
• Check idle switch input/output operation
• Check related connections and wiring
NOTE:
Always refer to the wiring diagram of the
unit being tested.
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