Switch Over Box-50 Amp; Locating Shorts And Opens - Airstream LAND YACHT MOTORHOME Owner's Manual

SWITCHOVER BOX (cont.)
When you have the optional 50 amp service, the red wire shown on the following diagram will be
providing power to the rear air conditioner whether you are plugged into city power or operating the
generator.

Locating Shorts and Opens

The key in locating shorts and opens is isolation. The first step to isolate the circuit with the short or open.
The second step is to then isolate the section of the circuit with the fault. Once the section is identified, the
specific problem can be located. The cause may be a loose or corroded connection, cut wire, worn
insulation, or defective component. The following procedure is one method for isolating shorts and opens.
SHORTS
1. Isolate the circuit that has the short by noting which circuit has tripped.
2 Disconnect the power inlet cord from the power source.
3. Using the 120V schematic as a reference, disconnect outlet boxes one it a time starting at the box furthest
from the distribution panel. After disconnecting each box, check for continuity between the black wire and
ground or common (white) wire on the distribution panel side of the circuit. When a continuity light or
ohmmeter indicates no continuity, the short is either in the receptacle just removed or the section of Romex
wire between this receptacle and the previous receptacle removed.
4. Examples of a short are:
A) The black wire of the 120V system contacting the white wire, bare wire, or grounded surface.
B) B) An internal short in a 120V appliance.
AIRSTREAM LAND YACHT GAS
SWITCH OVER BOX - 50 AMP
I-2