Briggs & Stratton 86262GS Familiarization & Troubleshooting Manual page 76

Testing Battery Charge Windings
• Set VOM to "OHM" scale.
If a single winding is used:
• Connect the meter test leads across wires
No. 55 and 66.
Compare the reading obtained with the resistance value
from the Briggs & Stratton Power Products
Generator Rotor/Stator Resistance Tables" Pub. #87971 Rev
6 or later.
If dual Battery Charge Windings are used, take meter
readings as follows:
• Read across Wires No. 55 (black) and 66 (brown).
• Read across Wires No. 55 (black) and 77 (brown).
Measure the resistance and compare it to the nominal
resistance from the appropriate table. Analyze the results the
same as in "Testing Single Voltage Type Power Winding".
NOTE:
The resistance table gives only two resistance
values for "multi-tap" Battery Charge Windings, even
though there are actually four (4) windings.The
difference in resistance between 55-66A and 55-77A, and
55-66 and 55-77 is minimal and insignificant.
Test 7:
— Bypassing the Voltage Regulator or Bridge
Rectifier
NOTE:
Bypassing the bridge rectifier and voltage
regulator are similar tests, the difference being that six
wires are unplugged from the voltage regulator where
only two or four are removed from the bridge
rectifier. During the bridge rectifier test you measure (AC)
output at the stator power and excitation windings only,
there are no sensing wires on a bridge rectifier system.
Verify that the field flash has taken place (Voltage Regulator
types only).Watch the light on the Voltage Regulator. If it
comes on at all, field flash has occurred.
• Disconnect all wires from the Voltage Regulator or
Bridge Rectifier and keep them completely isolated
from the circuit.
• Apply 12VDC to the brush wires, normally wires #4
(+), and #1 (-).
Portable Generator Familiarization & Troubleshooting Guide
• Start the generator (make sure the remaining wires are
Measure (AC) output across sensing wires #11 and #22 (on
voltage regulator types only). On bridge rectifier types,
measure (AC) output at the 120VAC receptacle. At least
60VAC should be measured, slightly higher is ok
(Figure 3.29).
®
"Portable
Figure 3.29 — Testing Power Winding Output
Measure (AC) output across excitation winding wires #2
and #6. At least 60VAC should be measured. It can be higher
(Figure 3.30).
Figure 3.30 — Testing Excitation Winding Output
74
Section 3 • Generator Diagnostics and Adjustments
not touching each other or the control panel, etc.).