Generac 8kW Air-Cooled — Testing Rotor Insulation
Testing & diagnosis
For the Generac 8kW Air-Cooled, from the Generac service manual.
Applies to: Generac V-Twin engine
Before you start
- DO NOT APPLY VOLTAGE LONGER THAN ONE SECOND
Procedure
- Remove brush leads or brush holders to isolate rotor.
- Connect red tester lead to positive (+) slip ring nearest rotor bearing.
- Connect black tester probe to clean frame ground.
- Set tester to 500 volts and plug into 120 V AC wall socket.
- Turn tester switch ON and verify pilot light.
- Observe breakdown lamp then turn tester switch OFF.
- DO NOT APPLY VOLTAGE LONGER THAN ONE SECOND.
- If breakdown lamp came on, clean and dry rotor and repeat test. If fails again, replace rotor assembly.
Tools required
- Hi-Pot tester Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 500 volts
- one second
Source: Generac service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.