Clarion OHM888VD Manuel De L'utilisateur page 26

dome light wire on the overhead monitor system.
5. Plug in any audio/video source cables.
6. Plug in the power harness into the overhead monitor system in the following order:
ground wire, battery wire, ACC wire and door wire.
Note:
Do not forget to connect the red ACC wire to the ignition switch.
If you do not connect this wire, the battery charge may drain off prematurely.
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