Connecting the power cords, Ground information, Negative ground system – Uniden PRO 540e User Manual
Page 3: Positive ground system
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A short "loaded" whip antenna is more convenient to install on your automo
bile, although the efficiency is less than a full quarter wave whip antenna.
For marine installation, consult your dealer for information regarding an adequ
ate grounding system and prevention of electrolysis between fittings on the hull
and water.
CONNECTING THE POWER CORDS
With regard to the connection of the power cords, it may be possible or desir
able to connect the red lead (for negative ground systems) or the black lead (for
positive ground systems) to the ignition switch accessory terminal so that the
radio is automatically turned off when the ignition switch (key) is turned off.
Alternately, the power lead may be connected to an available terminal on the
fuse block or even to a point in the wiring harness. Care must be taken, how
ever, to guard against a short circuit condition. When in doubt, please contact
your vehicle dealer for specific information about your vehicle.
GROUND INFORMATION
Most newer cars and small trucks use a negative ground system, while some ol
der cars and some newer, larger trucks may use a positive ground system. A ne
gative ground system is generally identified by the battery terminal being
connected to the vehicle motor block, but if you cannot determine the polarity
of your vehicle, consult your vehicle dealer for information.
NOTE: This radio may be installed and used In any 12-volt DC nega
tive or positive ground system.
NEGATIVE GROUND SYSTEM
If you are operating on a negative ground system, connect the red DC power
cord from the radio to the positive '-F" battery terminal or other convenient
point and connect the black power lead to the chassis or vehicle frame, or the
negative " terminal of the battery.
POSITIVE GROUND SYSTEM
If you are operating on a positive ground system, connect the black DC power
cord from the radio to the negative " battery terminal or other convenient
point and connect the red power lead to the chassis or vehicie frame, or the
positive ■+" terminal of the battery.
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