I
WARNING: If you replace or unhook your battery, ensure that the wires are
connected properly: Positive-Black; Negative-White.
Isolators
When an auxiliary or "house" battery is installed in a recreation vehicle, it's the nature of parallel
circuitry to draw energy from both batteries. A device called an "isolator" must be installed for two
purposes. First it receives current from the alternator and controls distribution of energy to house
and chassis batteries. Secondly, it serves as a check valve to prevent energy from being drawn from
the tow vehicle chassis battery. Energy in the tow vehicle battery is now preserved and can be used
to start your engine if needed.
The Jayco motorhome has a solenoid located on the cowl of chassis under the hood.
Master Battery Switch
Located near the motorhome entrance door there is a master battery switch. This master battery
switch controls all 12-volt power supplied to the "house portion" of the motorhome. This switch
must be "ON" before any electrical current will be supplied to the appliances, outlets, and lights.
During storage of your motorhome, it is important to have this switch in the "OFF" position.
NOTE: Make sure the master battery switch is in the "OFF” position during storage of the
motorhome to avoid draining current from the battery. If your motorhome has a
detachable in-dash radio face plate, it must be removed during storage to prevent
current draw from the auxiliary battery.
Interior 12-Volt Components
Fig. 4-30 shows a drawing of the 12-volt DC distribution center of circuits. Your interior lights,
furnace and other components will operate based on the layout in this image.
Auxiliary Start System
Your motorhome can momentarily connect the auxiliary and chassis batteries if the chassis battery
becomes discharged for any reason.
To start the unit when the chassis battery has been discharged:
1. Press the button on the dash, located on the left side of the steering column, and hold.
2. Use the ignition switch to start the engine.
3. Release the button after the engine has started.
To recharge the auxiliary battery:
1. When the motorhome engine is running, the alternator will automatically supply a charge to
replenish the auxiliary battery.
2. When parked at a campsite, plug into the shore line power. With minimal or no load on the
electrical system, the converter will automatically charge the auxiliary battery if plugged in
overnight.
The Systems 57
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