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I'm installing a stereo in an RV and would like to maintain default behavior of having the stereo receive power on vehicle accessory power/ignition, but also be controlled by a switch in the RV for use when the vehicle is not in use. These are the requirements:

  • When the RV switch is OFF, the stereo turns on and off with vehicle accessory power.
  • When the RV switch is ON, the stereo remains powered regardless of vehicle operation.
  • The source of power when the vehicle is running does not matter, but it must utilize the RV batteries when it isn't.

Would there be any problems with utilizing a ~30A 5 pin relay to achieve this? The stereo utilizes an external amp, so it will be drawing very little power.

12v 5 pin relay power supply switching

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It will work just as you have it drawn. But why not just use a SPDT switch to switch between house power and accessory power? Simpler, cheaper, more reliable, no down side immediately apparent...

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  • \$\begingroup\$ Yep, that's definitely an option. The reason I am considering the relay approach is due the DC switching being almost entirely contained within a marine style breaker/switch panel. I could add a separate switch panel for these use cases, but so far this is the only special case. \$\endgroup\$ – Andy Bas Aug 16 '18 at 1:00
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If the source of power when the vehicle is running doesn't matter, I'd just power the stereo from the RV "house" battery- why complicate things?

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  • \$\begingroup\$ Mostly for the end user experience. I could use a SPST to turn the stereo on and off manually or as the other answer suggests, use a SPDT to switch the two power sources. I'm still considering both of these, but if I use the relay approach, I can put the stereo switch within my main DC marine style circuit/switch panel and not have to introduce a separate switch panel elsewhere. \$\endgroup\$ – Andy Bas Aug 16 '18 at 1:06

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