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      08-30-2017, 11:59 PM   #1
mainsoda
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Fuse box question

I'm looking to wire up a dash cam in my Z4MC. Right now I can plug it into the cigarette lighter but unfortunately this is always hot and stays on even when the car is off.

I have a fuse "add a circuit" on the ready but I'm wondering where to try it. I want the camera to turn off when the car is not running and turn on when it is.

Where do you guys suggest I plumb this in on the fuse box?

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      08-31-2017, 07:29 AM   #2
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The easiest thing is to go through the fuse rack with a tester.
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      08-31-2017, 09:42 PM   #3
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Name:  2004 BMW Z4 (E85) Color Fuse Diagram.png
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      09-01-2017, 08:29 AM   #4
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Thanks StickMon!
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      09-01-2017, 11:19 AM   #5
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I can't take full credit.
Another Forumite went to the trouble of making it.
I just keep a copy close at hand.
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      03-25-2018, 03:52 PM   #6
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As I would like to add a circuit on my car as well, I was wondering where to attach the ground wire. Anybody has any suggestions (I would probably be putting the device in the wall between cabin and trunk on a coupe)?

Also would fuse 9 be empty with a manual car?
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      03-25-2018, 11:39 PM   #7
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Well, I was going to consult the WDS, but it needs Java, and Java appears to be an evolutionary dead end.
Grounds are usually solid brown. Find a connector near where you need it, find a solid brown wire, and ohm it out to the chassis.
Not sure about fuse 9. Seems that it would be extraneous with a manual.

On a related note, anybody know of a good post-Java solution to the WDS?
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      03-29-2018, 05:20 PM   #8
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I forget where I put my ground, there were a number of chassis screws nearby. I used spot F2.
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      04-04-2018, 08:49 AM   #9
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Why not tap into the power/ground in the rear view mirror/light circuitry? Think this video has the info I used when I did mine.

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      12-27-2018, 11:31 PM   #10
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Quote:
Originally Posted by elerner61 View Post
Why not tap into the power/ground in the rear view mirror/light circuitry? Think this video has the info I used when I did mine.
I was wondering the same thing. My daughter got me a dashcam for Christmas and now I need to figure out how to get it wired in. The wire mentioned in that video to tap into, what does it go to?
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      12-28-2018, 11:46 AM   #11
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Quote:
Originally Posted by gpraceman View Post
I was wondering the same thing. My daughter got me a dashcam for Christmas and now I need to figure out how to get it wired in. The wire mentioned in that video to tap into, what does it go to?
The mirror is where I tapped into for my radar detector. For the dash cam, I had to tap into the fuse box because it only takes 5V, so some type of step-down voltage regulator was required - either a cigarette lighter type or a straight dedicated 12V to 5V regulator box. Either solution would be too bulky to be stuffed in the overhead. Also, if you already have a radar detector tapped into the mirror circuit, you wouldn't want to take the chance with over-loading it with more accessories.

I did something similar to this for my dash cam
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      12-28-2018, 12:06 PM   #12
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Quote:
Originally Posted by XMetal View Post
The mirror is where I tapped into for my radar detector. For the dash cam, I had to tap into the fuse box because it only takes 5V, so some type of step-down voltage regulator was required - either a cigarette lighter type or a straight dedicated 12V to 5V regulator box. Either solution would be too bulky to be stuffed in the overhead. Also, if you already have a radar detector tapped into the mirror circuit, you wouldn't want to take the chance with over-loading it with more accessories.

I did something similar to this for my dash cam
No radar detector to worry about.

I ordered this wiring harness, which includes the 12V to 5V convertor. I was hoping to stuff that into the area behind the map light. Trimming off as much of the wiring before the convertor as I can.

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      01-17-2019, 10:28 AM   #13
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I installed Blackvue recently with PMP for parking mode. I tap into the two empty slots on the fuse box. There are bolts there you can use for ground.
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