Jayco Seismic 2021 - 12-Volt DC System

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12-Volt DC System
The majority of your recreation vehicle lighting is powered by 12-volt electricity. The 12-
volt DC system is composed of components that will operate when the following conditions
are met:
 Power is supplied by the tow vehicle alternator when the engine is running and the
7-way trailer plug is connected. This powers the RV’s running lights, brake lights, turn
signals and brakes. In addition, the 7-way trailer plug provides a common ground and
a 12-volt charge line to charge the auxiliary battery.
 The converter will supply interior 12-volt DC power when the power cord is plugged
into campground power. The converter will also charge the RV battery in most situa-
tions. (Refer to Battery Disconnect)
 The auxiliary battery powers many interior 12-volt components including the light-
ing xtures, water pump, 12-volt motors, 12-volt appliances, etc. It also powers the
breakaway switch.
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The 12-volt fuse panel is labeled to indicate fuse sizes, positions and the components pow-
ered. Fuses are located in the load center.

Before replacing a fuse, always turn o the electrical components protected by it.
1. Disconnect the shore power cord.
2. Turn “o” the inverter (if so equipped).
3. Disconnect the house or auxiliary batteries main negative battery cable.
4. Remove the fuse panel cover to check fuses.
5. Pull the fuse straight out of the fuse block.
6. Insert a new fuse of the same specied voltage, amperage rating and type in the original
location.
Replacement fuses must be of the same voltage, amperage rating and type.
 doing so may cause a re by
overheating the RV wiring.
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Green LED is on solid. Output voltage
is 14.4VDC to rapidly charge the battery up to 90% of full
charge.
 : Green LED ashes every 6-8 sec-
onds. Output voltage has been reduced to 13.2VDC; the
RV battery is fully charged and converter is maintaining
the charge.
    The wizard
mode button is used to override the charge wizard. Refer
to the converter owner’s manual for additional information.
  Reverse polar-
ity fuse(s) provide protection for the converter when a bat-
tery is used. If the battery is connected backwards to the fuse board a fuse will blow pre-
venting damage to the converter. Four easily accessible fuses are located next to the wizard
button. Replace with fuses of the same type and rating.