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FUSE BLOCKS AND MINI-BREAKERS
When a 12 Volt wire is ran, most of the circuits are protected with fuses or mini-breakers. These can be located at
various areas in the coach but are typically located near the main breaker panel. The following photos are examples
only. However, they may also be found in areas such as:
INTERIOR
• Rear bedroom
• Rear bathroom
• Closet
EXTERIOR
• Power cord compartment
• Left, front electrical compartment
(located beneath the driver window)
• Front firewall (gas coaches)
There are also some circuits that are
protected with an inline fuse. Some fuse
blocks have fixed relays integrated on a
board. The board below is located in the
cord compartment.
BASIC 12 VOLT POWER FLOW
Since a battery is only an electrical storage component, 120
Volt power must be present to charge the batteries from the
converter or inverter/converter combination unit. It is
necessary to have 12 Volt power supplied from the coach's
house battery bank in order to operate the interior lights and
other 12 Volt loads such as slideout control systems, water
pumps, vent fans, monitoring systems, etc.
Most of this power flows through the battery disconnect to
the fuse block or mini-breakers, which prevents overloading
the circuit prior to progressing to the 12 Volt load. There are
some 12 Volt circuits that do not go through the house
battery disconnect; however, these loads still pass through
a fuse or mini-breaker before progressing to the load.
IMPORTANT
When a 12 Volt load or component is not working, both 12 Volt power (+) and 12 Volt ground (-) are needed for
the load to complete the 12 Volt circuit.
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