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7.3 FAULT INDICATION
OPEN CIRCUIT
The MUTT senses no load which is often the symptom of a disconnected wire, cut
wire, poor pin connection or bad return ground. The MUTT can detect open circuits
in two ways.
1. During Ground Integrity Test: An individual circuit will blink and no audible alerts
will be present.
2. During circuit selection: The selected circuit’s LED will blink, while simultaneously the
Open Circuit Indicator will ash. The MUTT will also provide an audible alert (beep).
Example: The MUTT detects an open circuit in the Clearance Light Circuit. The
Clearance LED will blink, the Open Circuit Indicator will ash and the MUTT will beep.
NOTE: Open Circuit Indicator will only illuminate during circuit selection.
CROSSED CIRCUITS
The MUTT indicates that two or more circuits are back feeding or crossed. This can
be a symptom of two wires in the same harness wearing through their insulated
coating and connecting.
1. When a crossed circuit is identied, the selected circuit LED will illuminate steadily and
the circuit it is crossed with will ash. The MUTT will also provide an audible alert (beep).
Example: The MUTT detects that the Clearance and Tail/Tag are crossed while the
Clearance Circuit is selected. The Clearance LED will illuminate, the Tail/Tag LED will
ash and the MUTT will beep.
Example: Open circuit in Clearance Light
Example: Crossed circuit in Clearance and Tail/Tag Lights
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