Triplett Fox & Hound 3 – PN: 3397 - Manual (Page 29)

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In the grounded method (also called Line to Ground), one
clip of the FOX (either the red or green) is connected to
earth ground or a “fake ground”, and the other clip is con-
nected to the target wire. The target wire can be one wire of
a pair or a multiwire cable. See Figure 5. This method cre-
ates the strongest tracer tone, and is often used when wires
are traced through walls or ceiling. It is also useful for iden-
tifying a specific wire within a bundle of wires. If connection
to a true ground is not available, a large metal object can be
used as a fake ground. For example, a large metal desk or a
metal file cabinet can be used. When tracing wires in a car,
trailer, or RV, etc. the metal frame or body can be used as a
ground. When tracing wires in a boat (that is in the water)
with a wood or fiberglass glass hull, any piece of metal that
comes in contact with the water can be used as a ground.
Simply connect one clip of the FOX to the ground or fake
ground, and the other clip to the target wire.