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Service Manual

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5-12
Table of Contents
Twin Cylinder Engine Service Manual
February 2017 - Digital Edition
ELECTRICAL SYSTEM AND COMPONENTS
Voltage Regulator Testing
Setup
1. Shut off the engine.
2. Verify the battery is in good condition (minimum 12.5 VDC).
NOTE: If weak or no battery in the circuit, voltage regulator output will be zero.
3. Measure the battery voltage at the battery for baseline voltage reading.
Test 1 (Complete Circuit Test)
1. Set Digital Multi-Meter to DC volts.
- Connect the red lead to the positive post of the battery.
- Connect the black lead to the negative post of the battery.
2. Start the engine.
3. Measure the battery voltage as engine speed increases from idle to fast.
4. Compare to expected voltage (battery voltage up to 15.1 VDC with speed 2200 to 3300 RPM):
-If measured voltage is above or below expected voltage perform Test 2 (page 5-13).
-If measured voltage is in range, voltage regulator is working properly.