Generac — Test 12 – Adjust Voltage Regulator
Adjustments · Automatic Voltage Regulator (AVR)
From a Generac service manual covering: GP1800, GP1850, GP3250, GP5000, GP5500, GP6500, GP7000, GP8000. Check it applies to your exact model before use.
Applies to: Generac GP1800, Generac GP3250, Generac GP5000, Generac GP5500, Generac GP6500, Generac GP7000, Generac GP8000, Generac OHVI engine
Before you start
- Ensure all material is clear of the alternator before proceeding.
Procedure
- Remove cover from end of alternator assembly.
- Remove two screws holding down the voltage regulator (AVR).
- Leave AVR connected to stator and brushes.
- Set VOM to measure AC voltage.
- Connect VOM across a 240VAC socket.
- Set START-STOP-RUN switch to START.
- Turn adjustment screw clockwise to increase voltage, counterclockwise to lower.
Tools required
- VOM Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 240 VAC target
Full service-parts list: Generac GP1800 →, Generac GP3250 →, Generac GP5000 →, Generac GP5500 →, Generac GP6500 →, Generac GP7000 →, Generac GP8000 →
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.