Realistic HTX-100 Owner's Manual page 13

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Connect the bare end of the black wire to a metal
chassis part.
Note: Modern vehicles have many non-metallic
parts. If you connect the black wire to one of these
parts, or if one of these parts insulate the black wire
from the vehicle's main chassis, your transceiver
does not work.
Reconnect the vehicle's positive terminal cable. Turn
on the ignition and use a voltmeter or test light to con-
firm that +12V is supplied to the connector.
Turn off the ignition, and plug the power cord's
connector into the POWER jack on the back of your
transceiver.
Note: The power cord's connector and the POWER
jack are polarized, so the connector only plugs in one
way.
Black
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