Generac — Testing Stator Windings
Testing & diagnosis · Stator / AC Generator
From a Generac service manual — check it applies to your exact model before use.
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Before you start
- Stator leads must be isolated from other components, especially circuit boards, before testing
Procedure
- Disconnect and isolate all stator leads
- Set VOM to Rx1 scale and zero meter
- Test power phase windings AC1-AC2 and SL1-SL2 for resistance
- Test power supply winding PS1-PS2 for resistance
- Test timing winding TIM1-TIM2 for resistance
- Test for short-to-ground using Rx10,000 or Rx1K scale; reading should be infinity
- Test for shorts between windings by connecting between different winding leads; reading should be infinity
Tools required
- VOM (Volt-Ohm-Milliammeter) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Power phase winding 0.414-0 FridayParts $51.66.465 ohm
- Power supply winding 0.206-0.227 ohm
- Timing winding 0.102-0.116 ohm
- Battery charge winding 0.095-0.108 ohm
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.