THOR Jayco Precept 2021, Owner'S Manual

Page: 87 / 173

85
Section 6: Electrical System
Battery Isolator Solenoid (if so equipped)
The isolator solenoid breaks the connection between the house batteries and the chassis bat-
tery when the ignition key is in the “OFF” position.
Breaking this connection prevents discharge of the chassis battery (used to start the engine)
when using 12-volt devices in the house section of your motorhome.
When the engine is running the isolator solenoid engages allowing the house batteries to be
charged by the vehicle alternator.
Battery Isolation Manager (if so equipped)
Your motorhome may be equipped with a Battery Isolation Manager that monitors the bat-
tery voltage of both the chassis and house batteries over long periods of time. If it senses
a charging voltage it connects the two batteries together. If the charge system is overbur-
dened, it isolates both batteries. When batteries have reached a float charge state for (1)
hour, the batteries are isolated to prevent overcharging.
It will reconnect if either battery drops to approximately 80% charge and the other is being
charged. If batteries are not being charged they will be isolated to prevent an electrical draw
in one system from depleting the other battery.
Auxiliary Start System (if so equipped)
Depending on your model, the Battery
Boost switch (on the driver console) or the
Auxiliary Start button (under the steering
wheel on the lower dash) engages this so-
lenoid and joins the house battery with the
chassis battery to provide a “boost” to help
start the motorhome if the chassis battery
charge is low.
The auxiliary start switch can momentarily connect both the house
and chassis batteries should the chassis battery become discharged.
To operate, depress either the “Aux. Start” switch (located on the front driver’s dash) or the
Battery Boost switch on the driver console and hold it down. While the “Aux. Start” switch
or Battery Boost switch is depressed use the ignition key to start the chassis engine. Release
the “Aux. Start” switch (or Battery Boost switch) after the engine has started.
Load Center
The Load Center contains 12VDC fuses and 120VAC circuit breakers for almost all of the
electrical appliances and circuits in the RV. The 120V main breaker may be located in this
panel and will turn off all 120-volt power to the RV. Locations will vary by model. Refer
to the diagram inside the load center for
specific fuse assignments.
Motorhomes may have separate small
panels for breakers and fuses. They are
normally located in close proximity to
each other typically in the bed platform.
The converter is also mounted separately
(typically under the bed platform).
Table of Contents Maintenance Record