TM9456 Dual-Radio Installation and Programming Guide
Installing a Dual-Radio System
29
© Tait Limited
July 2016
Standby Current
Connecting the
Power Cable
Notice
Although it is possible to connect the radio system in line
with the vehicle ignition, this is not recommended, as it may draw too
much current and damage the vehicle wiring and steering column or
ignition switch. This may also cause the supply voltage of the radio to
drop below the specified level.
Notice
Disconnecting the vehicle’s battery may cause problems with
some electronic equipment, such as vehicle alarms, engine management
systems, and in-car entertainment systems. Check that the vehicle
owner has the necessary information to make all electronic equipment
function correctly after battery reconnection.
Notice
If the battery is not disconnected, exercise extreme caution
during the installation and install the fuses only when the installation is
ready to be checked. For more information, refer to
1.
Disconnect the vehicle’s battery unless specifically prohibited from
doing so by the customer, vehicle manufacturer, agent, or supplier.
Notice
Route the cables in a manner that minimizes coupling of elec-
tric vehicle systems such as alternators into the radio.
Notice
Protect the power cables from engine heat, sharp edges and
from being pinched or crushed.
2.
Run the power cable between one radio’s mounting position and the
power source and cut it to length, allowing approximately 20 cm
(8 in.) excess at the radio end.
3.
Plug the power cable into the power connector of the radio.
4.
Cut the negative (black) and the positive (red) wires where the in-
line fuse holders will be placed (as close to the power source as
possible).
Notice
Do not install the fuses until the installation is ready to be
checked. For more information, refer to
“Checking the Installation” on
Table 2.4
Estimated current drain for the TM9456 radio systems
Radio System
type
Completely off
(e.g. off via
ignition sense)
Stand-by (e.g. off
via on/off key)
On (no backlight)
but not
transmitting or
receiving
On (maximum
backlighting)
TM9456 Dual body,
single head
<8 mA
approx. 120 mA
approx. 200 mA
approx. 250 mA
