Generac 8kW Air-Cooled — Testing All Stator Windings to Ground
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 1 SECOND
Procedure
- Disconnect stator AC output leads 11 and 44 from main line circuit breaker.
- Remove wire nut joining stator leads 22 and 33 and separate leads.
- Disconnect stator excitation winding lead 2 at excitation circuit breaker CB2.
- Disconnect stator excitation winding lead 6 at voltage regulator.
- Disconnect stator battery charge winding lead 55 at resistor.
- Disconnect stator battery charge winding leads 66 and 77 at BCR.
- Connect terminal ends of all stator leads together.
- Connect red test probe to joined stator leads; black probe to clean frame ground on stator can.
- Set Hi-Pot tester to 500 volts. Apply test voltage for one second and observe breakdown lamp.
- If breakdown lamp comes on, clean and dry stator and repeat test. If fails again, replace stator.
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.