Thread: Question about Opus

The Opus has 3 leads - you connect the +12V and Ground wires to the battery (suitably fused of course) and the Ignition wire to any convenient point which goes +12V whenever the key is in the Acc or Run positions. I tapped one of the wires to my headunit for this purpose.

This is of course one way of wiring the Opus. Some people put a switch in series with the Ignition wire so that they can control whether the carPC turns on automatically (with the Ignition) or not.

A quick search will throw up several wiring diagrams that may help.