Installation Manual

14221-1850-4000, Rev. A
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Use stainless-steel self-locking hardware (i.e., machine screws with washers and locking nuts) or other
appropriate hardware to ensure reliable terminal-to-metal contact. Tighten securely.
5. At the back of the Control Head, tie and stow the cable as necessary.
6. For the positive 12-volt DC main power source connection, route the cable’s red wire to the location of
an unswitched 12-volt DC power source, typically near the vehicle’s battery.
Remove interior panels, door kick panels, etc. Protect the wire from possible chafing as necessary. This
is the Control Head’s main DC power source.
7. Obtain one of the orange-wired blade fuse holders included with the Control Head’s DC Power Cable.
8. Cut excess length from the red wire and crimp the fuse holder into it, near the location of the unswitched
12-volt DC power source connection point.
9. Using an appropriate electrical terminal, connect the red wire to the unswitched DC power source.
A ⅜-inch ring terminal is included with the cable for this purpose, but another terminal type (not
supplied) may be used if required.
10. Obtain the 5-amp blade fuse included with the cable and install it into the fuse holder.
The fuse for the Control Head’s red wire is rated at 5 amps. The 3-amp fuse included
with the cable must not be used for fusing the Control Head’s main DC power. It fuses
the head’s white wire.
Do not share the Control Head’s fuse with any other device. Doing so can cause excess
current to flow through the fuse, causing it to blow unnecessarily.
9.3.5 Ignition Sense (White Wire) Connection
Radio on/off power control is accomplished by the Control Head, except in the case of a data-only radio
installation which has no Control Head. In a standard installation, when the Control Head is turned on, it
“wakes-up” the radio via data activity on the Ethernet link.
A review of the Ignition Sense Location and Considerations information presented in Section 6.3.3, on page
30 may be beneficial. As required per the chosen power-up configuration, connect the white wire by
following one of the three procedures presented in the following sub-sections.
• Radio turns on and off automatically with vehicle’s ignition switch/key - The white wire of the
Control Head’s DC Power Cable is connected to a fused switched power source, typically identified as
vehicle “Accessory” power. This source must switch on (up to positive (+) battery voltage potential)
when the vehicle’s ignition switch/key turns on, and it must switch off (to near zero volts) when the
ignition switch/key turns off.
Ø The required fuse rating is 3 amperes.
Ø When using this configuration, the Control Head’s on/off/volume control must be left in the on
position for automatic power-up/down to function properly.
NOTE