Jensen BT-390 - Manual (Page 8)

2. Installation
o Connecting the Power Supply (For Options 1 and 2 only)
The following illustration demonstrates how to connect the
Car Kit’s power cables to the vehicle’s electrical system.
Important:
The blue cable must be connected to the 12/ 24V
switched to enable the Car Kit to go into standby
mode.
Do not connect the blue cable to the +12/ 24V
constant. Doing so may discharge the battery of
the vehicle and prevent the Car Kit from being
reset.
4