Mobile Installation; Power Connection - Midland 77-857 Owner's Manual

MOBILE INSTALLATION
Safety and operating convenience are the primary factors to consider when mounting any piece of
equipment in an automobile. Be sure that the transceiver controls may be easily reached by the
operator. Also be sure that connecting cables do not interfere with the operation of the brake, ac
celerator, etc.
POWER CONNECTION
The transceiver may be installed and used in any 12 volt DC negative or positive ground system
vehicle. Most newer U.S. and foreign-made cars and small trucks use a negative ground system while
some older cars and some newer large trucks may use a positive ground.
A negative ground system is generally identified by the (—) battery terminal being connected to the
vehicle motor block, but if you cannot determine the polarity system of your vehicle, it is suggested
that you contact your vehicle dealer for definite information.
NEGATIVE GROUND SYSTEM
Connect the red DC power cord from the transceiver to the positive or (+) battery terminal or other
convenient point and connect the black power cord to the negative or (—) battery terminal.
POSITIVE GROUND SYSTEM
In the case of a positive ground system connect the black DC power cord from the transceiver to
the negative or (—) battery terminal or other convenient point and connect the red power lead to the
chassis or vehicle frame or (+) battery terminal.
With regard to the connection of the power cords, it may be possible or desirable to connect the
(red lead for negative ground system) or (black lead for positive ground system) to the ignition switch
accessory terminal, so that the transceiver is automatically turned off when the ignition switch (key)
-- 7 —