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Backup Camera Video Cable Backfeeding 12V?

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Member - Posts: 24
Member spacespace
Joined: January†20, 2013
Location: Michigan, United States
Posted: February†04, 2019 at 2:37 PM / IP Logged Link to Post Post Reply Quote briandye
Installing a Dual brand double din headunit (model: XDCPA9BT) into my Polaris Slingshot. (2019 base model)
Using the reverse wire at the taillight for my 12v trigger, and a relay to convert the (-) reverse feed to a (+12v) trigger. The reverse lamps are negative switched. My headunit doesnít have the option to switch, so I used a relay to convert to a positive output. No issues there.
Before buttoning everything back up, I wanted to make sure it all worked.
The radio went right into the camera view when I turned it on, even though I wasnít in reverse. Itís a really dim, poor view, but itís there. When I go in reverse, it properly fills the screen with the camera view.
I troubleshooted down to the camera video wire somehow giving the radio 12 volts. With the radio completely unplugged, except the backup camera video wire, I was seeing 12v through the radios backup camera trigger wire.
Any ideas how to fix this? Iíve never had an issue like this before. Iím stumped. Thanks!
The camera is powered off the taillights constant 12v (with key) and the ground is tapped into the reverse light switched ground. No relay there. Also just noticed - when the vehicle is started, the backup camera view seems to have some interference. Lines going through the screen almost like an old VHS tape.
Edit again: I also just noticed that the reverse lights are on basically no matter what - if the camera power cord is connected to the camera and video connected to the radio. So something is backfeeding somewhere causing the relay to trip on, because when I unplug the camera power, I hear the relay click off.
2006 Explorer XLT
2009 Ford Fusion SEL
i am an idiot 
Platinum - Posts: 13,667
Platinum spaceThis member consistently provides reliable informationspace
Joined: September†21, 2006
Location: Louisiana, United States
Posted: February†04, 2019 at 5:49 PM / IP Logged Link to Post Post Reply Quote i am an idiot
Ground camera to chassis. Wire relay as follows. 85 to reverse light negative switched wire. 86 and 30 get 12 volts ignition. 87 powers camera and triggers radio reverse wire.

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