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Rear Window camera

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Old Jun 11th, 2019, 10:16   #1
AB-UK
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Default Rear Window camera

Since I found myself in possession of a spare NextBase dashcam, I thought I'd fit it to the rear window of my XC90.
I bought a hard-wire kit to attach the power cable to a fuse, but it seems all of the fuses in the rear quarter are ON all of the time.
I would prefer the camera to operate only when the engine is running, as the front one does since it's plugged into the lighter socket.

Have I missed something? Is there supposed to be fuse I can attach it to in the rear?

If not, my alternate idea was to crimp the power cable to one the rear driving lights, which only light up when the engine is running.

Clearly I am no auto electrician, so would anyone with such knowledge tell me if this would not be advised please?
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Old Jun 11th, 2019, 12:38   #2
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Use the trailer power which is switched
Otherwise lights will be fine. And much easier - use the number plate lights. Dash cams use very little power
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Old Jun 12th, 2019, 12:17   #3
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I am not sure about the newer cars but when I tapped in to my lights wiring on my older volvo 240 the bulb failure dash light came on permanently, as it upset the voltage signal, the low wattage of a dashcam might not upset this system but I would not tap in to existing wiring. Much better to find a fused supply.
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Old Jun 12th, 2019, 17:27   #4
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Quote:
Originally Posted by SwissXC90 View Post
Use the trailer power which is switched
Otherwise lights will be fine. And much easier - use the number plate lights. Dash cams use very little power
There are two with "trailer" in their descriptions.

I'm pretty sure we tried all of the fuses, and when the dashcam was connected to each one it received power even whilst the ignition was turned off.

Since you say there should be a powered-off connection I'll try them all again - when it stops raining soemtime.
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Old Jun 12th, 2019, 21:45   #5
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Use the wiring diagram to avoid guesswork
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Old Jun 13th, 2019, 12:42   #6
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Quote:
Originally Posted by AB-UK View Post
There are two with "trailer" in their descriptions.

I'm pretty sure we tried all of the fuses, and when the dashcam was connected to each one it received power even whilst the ignition was turned off.

Since you say there should be a powered-off connection I'll try them all again - when it stops raining soemtime.
There is always the 12V / lighter socket in the boot too
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Old Jun 13th, 2019, 13:56   #7
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Quote:
Originally Posted by Peachey169 View Post
There is always the 12V / lighter socket in the boot too
Not a good idea, that is a permanent power source. It never switches off.
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Old Jun 13th, 2019, 14:00   #8
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Quote:
Originally Posted by SwissXC90 View Post
Not a good idea, that is a permanent power source. It never switches off.
Good to know - ignore my previous idea!
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Old Jun 25th, 2019, 23:24   #9
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So, finally found a fuse which isn't constantly live.

Slot 20: Trailer wiring (15-feed) -> 20A Fuse (as SwissXC90 suggested)
This slot appears dead, but becomes live once the engine is running.
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Old Jun 30th, 2019, 09:49   #10
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exactly what I wanted to know
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