Generac — Reconnection for Dual Voltage
Installation · Generator stator and circuit breakers
From a Generac service manual covering: NP-50G, NP-50LP, NP-66G/LP, Q-40G, Q-55G/LP, Q-70G/LP. Check it applies to your exact model before use.
Applies to: Generac NP-50G, Generac NP-50LP, Generac Q-40G, Generac NP-50G/LP engine
Before you start
- Units reconnected for 120/240 volts dual voltage output will not be listed per RVIA.
- Not applicable to Q-40G model.
Procedure
- Gain access to generator panel interior by removing generator cover and front panel.
- Disconnect stator leads 11 and 33, T1 (red) and T3 (black) from main circuit breakers CB1 and CB2. Set aside T1 and T3.
- Disconnect stator leads 11 and 33 from the 4-tab terminal connector (TC).
- Disconnect stator leads 22 and 44 from the grounding terminal (GT).
- Disconnect one of the two T2 (white) leads from the grounding terminal.
- Remove existing circuit breakers CB1 and CB2. Install new appropriately rated circuit breaker.
- Connect stator leads 11 and 44 to new circuit breaker. Attach leads T1 (red) and T3 (black) to circuit breaker.
- Connect stator leads 22 and 33 to grounding terminal (GT).
- Be sure a neutral lead is installed and routed from grounding terminal for connection loads.
- Route leads T1 and T3 and grounded neutral lead through conduit clamp and out of panel.
- Reassemble panel and generator cover.
- Loads may be connected: T3 to Neutral 120 volts; T1 to Neutral 120 volts; T1 to T3 240 volts.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 120/240 volts dual voltage output
Full service-parts list: Generac NP-50G →, Generac NP-50LP →, Generac Q-40G →
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.