Generac G9.0L G26 — Perform Starter Circuit Voltage Drop Test
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
- Automatic start-up. Disconnect normal power source and render unit inoperable before working on unit.
Procedure
- De-energize the T1 circuit.
- Set a DMM to measure DC voltage.
- Connect red lead to positive battery post, black lead to negative post.
- Turn off fuel source and remove Wire 14 from fuel solenoid.
- Set controller to MANUAL and measure voltage at test points A, B, and C.
Tools required
- Digital multimeter (DMM) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 0.00–0.10 VDC across a connection
- 0.10–0.20 VDC on a ground connection
- 0.20–0.30 VDC across a wire or cable
- 0.20–0.30 VDC across a switch or starter contactor
- 0.40–0.50 VDC across the entire circuit
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.