Service Manual

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Table of Contents
Twin Cylinder Engine Service Manual
February 2017 - Digital Edition
ELECTRICAL SYSTEM AND COMPONENTS
Voltage Regulator Testing (Cont.)
Test 3 (Test Voltage Regulator Only)
1. Set Digital Multi-Meter to DC volts.
- Connect the red lead to the red wire of the engine harness plug (DO NOT unplug from chassis harness).
- Connect the black lead to the ground on the engine block.
2. Start the engine.
3. Measure the battery voltage as engine speed increases from idle to fast.
4. Compare to expected voltage. Expected voltage range (battery voltage up to 15.1 VDC with speed 2200 to
3300 RPM).
a. If measured voltage is above or below expected voltage, replace the voltage regulator.
b. If measured voltage is in range, voltage regulator is working properly and the ground circuit has an issue
between the engine and battery:
- Inspect the battery cables and terminals for corrosion, clean terminals and/or replace cables.
- Verify ground connections, negative battery cable to engine and voltage regulator to sump cover.
c. Repeat Test 1 to validate charging system is working properly.