CRT ALPHA, Owner'S Manual

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The voltage has to be 13,8V or 24 V DC with negative grounding. Ensure that the positive
(+, red) and negative (-, black) polarity is correct, before you connect the radio. The wiring
has to be done by an authorized technician.
Connect the power cable directly with the battery. Do not use a cigarette lighter adapter
because this kind of connectivity might not provide enough current for a proper operation of
the radio. Pay special attention to the correct polarity, when connecting the cable into the
battery.
CAUTION : please ensure proper polarity - check the fuse before first use of the radio.
Missed or defect fuses need to be replaced before operation of the radio.