House Battery Charging when driving

[TugBoatGuy]

Just need to confirm how the Boost solenoid works.
When cranking the engine if you press the rocker switch on the dash ( my model) the Boost Solenoid closes and connects the house battery to the Start battery through the large cable that runs from it to the start solenoid by the start battery.
When the engine is running the boost solenoid is closed due to the ignition being in the run position and current available from the alternator or ignition switch?
I'm installing Lithium Battery/Inverter Charger/Dc to Dc charge controller

 

[Utclmjmpr]

Better known as a "combiner" switch..>>>Dan

 

[John Canfield]

Better known as a "combiner" switch..>>>Dan

Winnebago calls it the Battery Mode Switch.

Before you start messing with the 12V system, please download and print your low voltage wiring diagrams. Here's a basic (simplified) diagram of our former Horizon (diesel pusher):

[House battery bank] <> [disconnect solenoid] <> [battery mode solenoid] <> Chassis battery

The disconnect solenoid is operated by a red switch by the entrance door. The battery mode solenoid is operated either 'automatically' via the ignition switch when you start the engine or when you press the Battery Boost switch.

Your battery mode solenoid and disconnect solenoid are most likely right next to each other.

 

[Gary RV_Wizard]

Your understanding of how it works is correct. You manually close the solenoid with the Boost (aka Aux Start) and it also gets closed while the ignition is on (engine running). If the coach has a "smart combiner" or "echo charge" or "battery control center" module, the ignition-on closing may be delayed until the chassis batteries reach some pre-defined state of charge.