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there is a couple of things you can do...
the most reliable and most expensive is get a special relay that automatically tricks your head unit for about $75 (PM for the model # because i don't have it in front of me)
option #2: or you run the foot brake cable (+) to the parking lights and the parking brake cable (-) to a toggle switch connected to the neg of the cig lighter.....you turn on the parking lights, toggle the switch a couple of times (making sure to leave it in the "on" position) then turn off the lights and you should be able to watch at your leisure. you can also turn your headlights on after that and it will still work fine. I have the alpine iva-w200 with the switch under my dash by my knee and it works just fine
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