Generac G9.0L G26 — Perform a Load Test on the Battery
Testing & diagnosis
For the Generac G9.0L G26, from the Generac service manual.
Applies to: Generac 130 kW PME, Generac 150 kW PME, Generac 9.0L Gaseous Engine (G26) engine
Before you start
- Explosion. Batteries emit explosive gases. Always disconnect negative battery cable first to avoid spark.
Procedure
- Remove 7.5 amp fuse from the controller.
- Remove the T1 fuse from the transfer switch.
- Disconnect both negative and positive cables; disconnect negative cable first.
- Using a suitable load tester, test the load capability of the battery.
- Follow the load tester manufacturer's instructions carefully.
- Reconnect both positive and negative cables; reconnect positive cable first.
Tools required
- Conductance battery load tester Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- If DMM indicated less than 10.5 VDC, remove battery and recharge with automotive battery charger.
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.