Triplett Fox & Hound 3 – PN: 3397 - Manual (Page 44)

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If tracing wires in a boat that is out of the water, attach one
clip of the FOX to the metal trailer frame, or to a grounded
metal object. As before, an extension wire can be used if
necessary.
8.1.4.9: Alarm / Security Wires:
Alarm and security wires can be traced like other wires..
8.1.4.10: Miscellaneous Multiwire Cables:
Some general principles are important to keep in mind when
locating and tracing wires and cables.
Any wire with a signal on it, which runs parallel to another
wire or wires tends to couple its signal to the other wires
(crosstalk). The closer the wires are together, and the longer
the parallel run, the more signal that is coupled. This situa-
tion occurs in multiwire cables, and when wires are bundled
together when installed.
Luckily, if the other wires are low impedance (they have loads
on them), the coupled signal will be lower in level. So, in
general its best to disconnect the wire being traced from its
loads, leaving other paralleling wires still connected to their
loads. If the other wires do not have loads (like when they
are being installed), it helps to temporarily connect one end
of the wires to earth ground, so that they do not interfere
with the trace.
The loading effect can also be used when trying to locate an
open fault in a wire in a multiwire cable. By leaving the loads