MM-015371-001, Rev. C
51
10.1.4.2.1
Control Head and Radio Turn on with Vehicle’s Ignition Switch/Key
With this wiring configuration, the control head and radio automatically turn on and off with the vehicle’s
ignition switch/key. The white wire of the control head’s DC Power Cable is sometimes referred to as the
“white ignition switch wire” or the “ignition sense input wire.” In this configuration, the white wire
connects to a switched power source, typically identified as “Accessory” power, that switches on and off
with the vehicle’s ignition switch/key. When using this configuration, the CH-721 control head’s
on/off/volume control must be left in the
position for automatic power-up/down to function properly.
The white ignition sense wire must be connected to a fused power source that switches
from approximately zero volts to approxi13.6 volts when the vehicle’s ignition
switch/key is turned from the OFF position to the ACCESSORY and RUN positions.
Use of a switched power source that is subject to voltage changes as a result of other
actions may result in undesirable radio operation and/or a degradation of radio
performance.
1.
Locate the vehicle’s switched ignition or “Accessory” power connection point that will be used for
the switched ignition 12-volt DC power source. This point is typically located at or near the vehicle’s
fuse panel. Consult the motorcycle manufacturer’s wiring diagram as necessary.
2.
Route the white wire of the control head’s DC Power Cable to the area near this connection point.
Protect the wire from heat and chafing as necessary.
3.
Obtain one of the waterproof (HFB-type) fuse holders included with the control head’s DC Power
Cable.
4.
Cut excess length from the white wire and splice the fuse holder into it, near the location of the
connection point.
5.
Using an appropriate electrical terminal, connect the white wire to the switched power connection
point. An open-barrel spade terminal is included with the cable for this purpose, but another type of
terminal (not supplied) may be used as required.
6.
Obtain the 3-amp AGC-type fuse included with the cable, and install it into the fuse holder.
7.
Tie and stow all wiring as necessary so it remains out of the way of casual contact and wire chafe is
avoided.
10.1.4.2.2
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 ignition key must
be removed from the vehicle and a separate on/off switch is acceptable and/or required. In this
configuration, the white wire connects to a fused switched power source such as that provided by a toggle
switch mounted on the vehicle’s instrument panel. When using this configuration, the CH-721 control
head’s on/off/volume control must be left in the
position for automatic power-up/down to function
1.
Route the white wire of the control head’s DC Power Cable to an area near the location of the panel-
mounted on/off switch. Protect the wire from heat and chafing as necessary.
2.
Cut a short section (6 to 8 inches) off the end of the white wire and strip the ends.
3.
Obtain one of the waterproof (HFB-type) fuse holders included with the control head’s DC Power
Cable, and crimp one half of it to one end of the short section of wire.
