Backup Camera with optional power source bypass switch

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Discussion Overview

The discussion revolves around the installation of a backup camera on a motor home, specifically focusing on the addition of a switch to allow the camera to be used as a rear-view mirror while driving. Participants explore the need for diodes in the circuit to prevent unintended activation of the reverse lights and to manage power flow from the switch.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant describes the installation of a backup camera triggered by the reverse light wire and proposes adding a switch to use the camera while driving.
  • Another participant suggests that an additional diode may not be necessary to prevent 12 volts from traveling back to the manual switch.
  • A participant questions the power consumption of the camera and the trigger for the LCD screen, indicating uncertainty about the current requirements.
  • One participant proposes connecting the camera directly to the general switched 12V for the motor home, suggesting that the low power consumption may not require a switch.
  • Another participant mentions the possibility of using the head unit's NAV button to activate the camera instead of a manual switch.
  • A later reply confirms success with the installation of a 1N4007 diode, indicating that it resolved the issue.

Areas of Agreement / Disagreement

Participants express differing views on the necessity of diodes and the best approach to wiring the backup camera. Some propose alternative methods for activating the camera, while others focus on the diode solution. The discussion remains unresolved regarding the optimal configuration.

Contextual Notes

Participants express uncertainty about the power consumption of the camera and the trigger mechanism, which may affect the proposed solutions. There are also varying opinions on the necessity of diodes and the implications of different wiring methods.

Whitetm
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I just installed a backup camera on my motor home , which is triggered by the reverse light wire. I would like to add a switch to the circuit so while I'm driving or just to be able to turn on the backup camera (using it as a rear-view mirror) without putting the vehicle in reverse. I probably need to add 1 diode to the backup light wire to prevent the backup lights from coming on when I turn on the camera using the additional switch (bypass). And will I need an additional diode to be installed on the bypass switch to prevent 12 volts traveling back to the manual switch as well? If I'm on the right track about all this, what size diode or diodes will I need?
 
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Whitetm said:
will I need an additional diode to be installed on the bypass switch to prevent 12 volts traveling back to the manual switch as well?
No. "Size?" Voltage rating --- 12+ volts in principle --- in practice, diodes are cheap --- 50-100 covers transients; current rating --- you're not likely to have a clean heat sink for long if you go to the trouble of using one --- camera current times five or ten for a wire and forget installation.
 
Bystander said:
No. "Size?" Voltage rating --- 12+ volts in principle --- in practice, diodes are cheap --- 50-100 covers transients; current rating --- you're not likely to have a clean heat sink for long if you go to the trouble of using one --- camera current times five or ten for a wire and forget installation.
I'm not understanding what your telling (sorry). The power consumption of the camera is nil about .5 watts max, I'm not quite sure what the power consumption of the trigger is to start up the LCD screen. The unit is a kenwood Dx5120 which is a stereo/DVD player with the option for a backup camers
 
Whitetm said:
I just installed a backup camera on my motor home , which is triggered by the reverse light wire. I would like to add a switch to the circuit so while I'm driving or just to be able to turn on the backup camera (using it as a rear-view mirror) without putting the vehicle in reverse. I probably need to add 1 diode to the backup light wire to prevent the backup lights from coming on when I turn on the camera using the additional switch (bypass). And will I need an additional diode to be installed on the bypass switch to prevent 12 volts traveling back to the manual switch as well? If I'm on the right track about all this, what size diode or diodes will I need?

Whitetm said:
I'm not understanding what your telling (sorry). The power consumption of the camera is nil about .5 watts max, I'm not quite sure what the power consumption of the trigger is to start up the LCD screen. The unit is a kenwood Dx5120 which is a stereo/DVD player with the option for a backup camers

Can you just connect the camera to the general switched 12V for your motorhome? If it's that low power, there's not really a reason to shut it off when the motorhome is on...
 
I could and probably will if I can't figure this out. I just like to take it one step further. Plus when the camera is on it interrupt the srereo/dvd. I guess it's the idea of always flipping the switch on and off. If you know what I mean.
 
any diode will probably work...
camera.png
 
Can't you just press the NAV button for a few seconds to turn on the camera and view it from the headunit. I've got a Kenwood 812 that works that way. The camera is powered from the ACC bus and the reverse wire is connected to the headunit to switch to that video source when triggered by the reverse wire.
 
Thank you, Actually I figured it out all ready. I installed a 1N4007 and it works great. I remembered when I installed a remote starter in my wife's car there was a instance where a 1 amp rectifying diode was need too. At that time I purchased 20 of them because all of our family members wanted remote starters, so I have plenty of them to use.
 
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