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EARTHBOUND RECREATIONAL VEHICLE TRAILER OWNER'S MANUAL
120-VOLT AC PANEL BOARD
This panel contains the 120 V branch circuit breakers for your RV. One of the breakers controls
the 120-‐volt power to the 12-‐volt converter section. This breaker may also control another branch circuit. Check the
label next to each breaker for what each branch circuit breaker controls.
The 120 volt circuits may be turned “on” my putting their breaker handle up to the on position or “off” by
flipping the handle down to the off position. To reset the tripped breaker move handle to off then on.
CONVERTER COOLING SYSTEM
The electronic fan cooling system is the key to long life and trouble-‐free operation. The fan is never
on more than required to cool electronic components in the converter. You may never hear the fan operate.
Converter
The converter transforms 120-‐volt alternating current (AC) into 12-‐volt direct current (DC). This provides
power to charge the trailer battery and to operate the 12 volt interior lighting, fans, and appliances.
The converter is energized only when the trailer is hooked up to 120-‐volt city power.
Converter Testing
A. Confirm 120 volt power is going into converter.
B. Disconnect the 12+ wire from the master switch.
C. Using a voltmeter check voltage output between heavy positive and negative wires coming out of
converter.
D. The voltage must be within 13.8 and 14.0 volts. (The meter of the tester should be calibrated
periodically.)
E. If converter is not within these voltages, have it serviced by a qualified technician or replace it.
TROUBLE SHOOTING
The most common failure in the exterior electrical system is an open circuit. An open circuit is an
interruption in the current flow, which may be in either the wire to the component or in the ground return.
Check the following areas for open circuits:
1. Light bulb (filament open).
2. Loose or corroded connections at lighting device.
3. Loose or corroded connections at 7 way connectors.
4. Improper grounding at the lighting device.
A continuity light or an ohmmeter will help you isolate the point of the "open" on the circuit.
Another cause of failure is a short circuit usually resulting in a blown fuse or cycling circuit breaker at the
power source. The wire coming in contact with a sharp edge usually causes a short. The sharp edge wears
the wire's insulation away until the "hot" wire shorts against the metal.
