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9.5.3.2
Control Head and Radio Turn On with a Manual Switch
With this wiring configuration, the Control Head and radio are manually turned on and off via an on/off
switch mounted separately from the Control Head and radio, not through the vehicle’s ignition
switch/key. This configuration is used when, for example, the radio must remain on even when the igni-
tion key must be removed from the vehicle and a separate on/off switch is acceptable. In this
configuration, the white wire connects to a switched power source such as a toggle switch mounted on the
vehicle’s dash.
1.
Route the white wire of the Control Head’s DC Power Cable from the back of the unit to an area near
the on/off switch’s location. At the back of the Control Head, be sure to maintain a cable service loop
of at least six (6) inches.
2.
Cut a short section (6 to 8 inches) off the end of the white wire and strip the ends.
3.
Extend the length of the Time-Delay Relay’s white wire so that it reaches the switch. Use the
18-AWG moisture-resistant butt-splice included in the fuse kit and extra white wire. Extra wire is not
included, but in most cases there will be enough extra white wire from the DC power cable to
accommodate this wire extension. Cut excess length from this wire.
4.
For a new on/off switch (not supplied):
(a)
Tap a wire off non-switched battery power from the vehicle’s fuse box with an 18-AWG wire.
(Use wire remaining from the power cable, if available.) Keep wiring as short as possible and use
approved wiring methods. Use techniques presented in section 9.5.3.1 as a reference.
(b)
Strip and crimp this tap to one side of the ATM fuse holder included in the fuse kit. The fuse
holder has built-in crimpable joints.
(c)
Crimp the short wire to the other side of the ATM fuse holder and connect the other end of this
wire to the common terminal of the manual switch.
(d)
Connect both the white wire of the power cable and the extended wire from the relay to the load
(switched) side of the manual switch.
For an existing switch:
(a)
Crimp the short wire to one side of the ATM fuse holder and connect the other end to the load
(switched) side of the manual switch.
(b)
Crimp the both white wire of the power cable and the extended wire from the relay to the other
side of the ATM fuse holder.
5.
Install the 2-amp ATM fuse into the fuse holder. It is recommended that a piece of electrical tape be
wrapped around the fuse connection to keep the fuse from being jostled out of the holder.
6.
Tie and stow these wires as necessary so they remain out of the way of casual contact and wire chafe
is avoided.
7.
Label this power switch accordingly. For example: “
RADIO ON/OFF
.”
9.5.3.3
Control Head and Radio Are “Hot Wired”
In the “hot-wired” configuration the Control Head and radio are turned on and off only by the Control
Head’s on/off power button located on the front of the unit. This configuration should only be used in a
temporary setting in which the operator keeps in mind that the Control Head must be turned off when not
in use to avoid unnecessarily discharging the vehicle’s battery. Furthermore, even when off, the Control