Generac — Test Stator Insulation Resistance
Testing & diagnosis
From a Generac service manual covering: 9202-1, 9203-1, 9204-1, 9205-1, 9206-1, 9207-1, 9290-2, 9509-2, 9592, 9593-0, 9593-1, 9593-2…. Check it applies to your exact model before use.
Applies to: Generac 9592
Before you start
- Do not apply voltage longer than one second.
- Do not connect tester leads to any leads routed into the generator control panel.
Procedure
- Disconnect and isolate all stator leads.
- Connect the terminal ends of all stator leads together.
- Connect tester leads across all stator leads and to frame ground on the stator can.
- Apply a voltage of 1500 volts; do not apply longer than one second.
- If breakdown indicated, clean, dry and re-test; replace stator if it fails the second test.
- Also test between isolated windings and between parallel windings at 1500 volts.
Tools required
- megohmmeter or hi-pot tester Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Stator test voltage 1500 volts
- Minimum insulation resistance = rated volts / 1000 + 1 megohms
Full service-parts list: Generac 9592 →
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.