1

I have a USB socket off my ODB port (I know!). it powers my satnav but my question is this: If I turn off my satnav but leave it plugged in to the USB is there any current draw?

Thanks to any wizard out there who can answer this with some authority ;-)

3
  • 1
    Does you satnav really turn off, or just go into a sleep mode?
    – Jon Custer
    Commented Jun 30, 2023 at 15:27
  • What satnav? When I turn off my phone and then plug it into a USB power supply, plainly it responds and draws current. It is never 'off' unless you remove the battery. Commented Jun 30, 2023 at 20:53
  • Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking.
    – Community Bot
    Commented Jul 1, 2023 at 14:31

1 Answer 1

1

Pin 16 on your OBD port will have power regardless of the position your ignition is in. It's always hot, delivering battery voltage and allowing up to 4 amps draw. Pins 4 and 5 are ground.

Whether your satnav will draw current if turned off depends on your satnav. Some satnavs will recharge their internal battery if plugged into a power source, even if turned off.

To be safe I would unplug your satnav when you turn the engine off and only plug it in if the engine is on.

Or you could be like me and get a deep discharge battery for your car. Then it's safe (or at least, safer) to run your electronics off the battery even if the engine is off. A regular car battery can be drained by electronics more quickly than you might think so it won't be able to start your car.

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .