User Manual

20
detailed description on how to configure the Ignition Sense line, see
the section
Configure Ignition Sense Jumper
on page 15.
Regardless of how the ignition sense line is configured, the option
cable must be wired as described below for the feature to work.
Connect Pin 13 of the option cable to an ignition “ON” sense point
(preferably an “Accessory” point in the vehicle fuse panel) that is
switched on when the vehicle ignition switch is in the ACCESSORY
and RUN positions. This lead should be connected so the vehicle
fuse protection is used. See Figure 6.
#
The DB-25 male connector that connects to the option
cable is user-supplied.
The “Accessory” point should drop to ZERO volts when cranking
the engine and return to +12 volts after the engine is started. If a
point is chosen that drops to a voltage between zero and +12
volts, the radio may execute a power-up cycle several times
during start up. It is recommended that the terminal be
measured with a voltmeter to be sure it shuts off (goes to zero
volts) during the cranking of the engine.
Certain problems may be encountered when accessory
equipment is connected to the ignition or accessory lines of the
vehicle, where these lines may have large filter capacitors and a
leakage path present. If the radio does not turn off within a
reasonable amount of time after the ignition is turned off, first try
a different accessory or ignition A+ pick up point in the vehicle.
Many vehicles have more than one circuit that is switched by the
ignition switch, and one may be available that does not have
large filter capacitors or a leakage path present.
If a different pickup point cannot be found, then add a 470-ohm,
1-watt resistor from the ignition A+ pick point to ground. This will
discharge the capacitor(s) or reduce the leakage voltage to a low
value. Current drain through this resistor will be minimal (less
than 0.03A) when the ignition is switched on.
CAUTION