Briggs & Stratton 86262GS Familiarization & Troubleshooting Manual page 80

Test 3:
— Isolate the System Control Board
Locate the power regulator circuit board inside the rear
bearing carrier.This board is similar to the bridge rectifier on
some other models.
• Disconnect the 3-prong white plastic plug.
This is called the snubber feedback cable
(Figure 3.33).
Figure 3.33 — Disconnecting Snubber Cable
• Start the engine.
Measure the (AC) voltage at the VAC panel receptacle.
Voltage should be between 130-150VAC.
If the voltage reading is less than 130VAC:
Go to "Step 5:Testing the Excitation Input."
If the voltage reading is between 130-150 VAC:
• Shut down the unit.
• Connect a jumper wire across the two outside pins of
the Power Regulator Board (from where the snubber
cable was disconnected (Figure 3.34).
Portable Generator Familiarization & Troubleshooting Guide
Section 3 • Generator Diagnostics and Adjustments
Figure 3.34 — Installing Jumper Wire
• Start the engine.
Measure the voltage at the 120VAC panel receptacle.
It should read less than 10VAC.
If the voltage is less than 10VAC:
The failure is in the System Control Board.
If the voltage is still between 130-150VAC:
Replace the Power Regulator Board.
Test 4:
— Check And Adjust Governor
Refer to the appropriate engine manual.
Test 5
: — Testing the Excitation Input
NOTE
:The Excitation Winding is connected to the
stator power winding inside of the stator assembly.
Because of this, there is a phase relationship
between the two windings and the excitation leads
must be installed in the correct position on the
Power Regulator Board.
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