Grounding Points SLK230 - Mercedes Benz SLK Forum

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#1 Old 11-16-2017
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Grounding Points SLK230

Hi guys! I am in the process of installing a dash cam DVR mounted to my rearview mirror. It need 12V source to power the camera. I do not want to connect it to cigarette lighter, instead I purchased a hardwire kit.

The hardwire kit connect to the camera through a micro usb cable and at the other ends there is 5A fuse and grounding cable. I tried to connected the fuse to the fuse box under the dashboard on the driver side. There are three bolts near the fuse box which tapped on the body. I tried to connect the negative cable of the hardwire kit to one of those, but it failed. It seems that it is not a good ground point.

Could somebody share their knowledge of ground point locations in 199 MB SLK230?
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#2 Old 11-17-2017
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#3 Old 11-17-2017
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Thank you @Avel Du. I found several good grounding points in the engine bay area, but I do not know how to feed ny wire to the engine bay from the interior.

So, before I continue, I will tell you guys what kind of hardwire kit I am using:



I am sorry, I am away from my PC, so I just use my phone to do this post. I purchased the hardwire kit above from Amazon:

https://www.amazon.com/AUTO-VOX-Hard...f_=ya_aw_od_pi

I decided to cut the end of the wire and follow the post by @savcom to power my rear view mirror dash cam DVR:

https://www.slkworld.com/showthread.php?t=419842

This is how I power my camera following @savcom ?s post:



The hardwire kit for the camera comes with a 5A fuse to the positive end. This makes the camera turn off by itself when we turn of the car?s ignition. Since I cut the fuse to connect it with the dome light power, now I have to manually turn off the dash cam eveytime I parked the car. Not a big deal for me ?

Now that I have another question, not related to a grounding issue, but still related to project I?m currently working on. I want to power up backing camera which also a part of my dash cam system. The manual said that I have to power the backing camera by tapping to reverse light so that everytime we put the gear on reverse, it will automatically shows the rear parking guidelines.

I found where is the location of the reverse light and it?s power cable. It basically has similar power cable like the dome light, with 6 pin connector.

[IMH]https://t.imgbox.com/p0sFVju5.jpg[/IMG]

The problem is, I am not sure which one is the positive cable.



I tested the pin no 6, the brown cable, it is the negative one. The multimeter showed 12.xx Volt reading. I did this by tapping the black probe of the multimeter to the broown cable pin, while I tap the red probe of the multimeter to the positive end of the car?s battery.

I tried the other way to find the positive cable of the reverse light, which should be the remaining pins other that pin no 6. Black probe of the multimeter to the negative end of the car?s battery, and the red probe to the rest of the pins.

Now the problem is, none of them showing voltage reading on the multimeter.

Can someone please educate me?

Probaly @Avel Du, @jbanks15 or @savcom know this issue..

Many thanks!
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#4 Old 11-17-2017
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#5 Old 11-18-2017
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Quote:
Originally Posted by geophysicist View Post
Thank you @Avel Du. I found several good grounding points in the engine bay area, but I do not know how to feed ny wire to the engine bay from the interior.

So, before I continue, I will tell you guys what kind of hardwire kit I am using:



I am sorry, I am away from my PC, so I just use my phone to do this post. I purchased the hardwire kit above from Amazon:

https://www.amazon.com/AUTO-VOX-Hard...f_=ya_aw_od_pi

I decided to cut the end of the wire and follow the post by @savcom to power my rear view mirror dash cam DVR:

https://www.slkworld.com/showthread.php?t=419842

This is how I power my camera following @savcom ?s post:



The hardwire kit for the camera comes with a 5A fuse to the positive end. This makes the camera turn off by itself when we turn of the car?s ignition. Since I cut the fuse to connect it with the dome light power, now I have to manually turn off the dash cam eveytime I parked the car. Not a big deal for me ?

Now that I have another question, not related to a grounding issue, but still related to project I?m currently working on. I want to power up backing camera which also a part of my dash cam system. The manual said that I have to power the backing camera by tapping to reverse light so that everytime we put the gear on reverse, it will automatically shows the rear parking guidelines.

I found where is the location of the reverse light and it?s power cable. It basically has similar power cable like the dome light, with 6 pin connector.

[IMH]https://t.imgbox.com/p0sFVju5.jpg[/IMG]

The problem is, I am not sure which one is the positive cable.



I tested the pin no 6, the brown cable, it is the negative one. The multimeter showed 12.xx Volt reading. I did this by tapping the black probe of the multimeter to the broown cable pin, while I tap the red probe of the multimeter to the positive end of the car?s battery.

I tried the other way to find the positive cable of the reverse light, which should be the remaining pins other that pin no 6. Black probe of the multimeter to the negative end of the car?s battery, and the red probe to the rest of the pins.

Now the problem is, none of them showing voltage reading on the multimeter.

Can someone please educate me?

Probaly @Avel Du, @jbanks15 or @savcom know this issue..

Many thanks!
I can certainly help but I'm away seeing my daughter and her new baby this weekend. I do have my laptop with me so I can look up diagrams from my previous posts and reply more formally then.

If you look at my thread on adding speakers and an amplifier you will see I mention how to get wires through to the engine bay but this isn't needed if you just need an earth.

If you look at how I changed my reversing lights to LED you will also find the signals you need to power the camera.
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#6 Old 11-18-2017
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I've found the links to my previous posts:

Wiring the reverse lamps as LEDs (note: facelift R170 so do check!!)

Wiring the dashcam (note: facelift R170)

Wiring the amplifier (post 12) Note here that there is an earth point in the passenger footwell where the Bose amplifier is grounded. See Post 14 of the same thread for more details (remember I'm RHD - you're LHD)
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#7 Old 11-19-2017
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Quote:
Originally Posted by geophysicist View Post
Hi guys! I am in the process of installing a dash cam DVR mounted to my rearview mirror. It need 12V source to power the camera. I do not want to connect it to cigarette lighter, instead I purchased a hardwire kit.

The hardwire kit connect to the camera through a micro usb cable and at the other ends there is 5A fuse and grounding cable. I tried to connected the fuse to the fuse box under the dashboard on the driver side. There are three bolts near the fuse box which tapped on the body. I tried to connect the negative cable of the hardwire kit to one of those, but it failed. It seems that it is not a good ground point.

Could somebody share their knowledge of ground point locations in 199 MB SLK230?
Here's an overview of interior groundpoints.
Attached Files
File Type: pdf Arrangement and assignment of ground terminals (cockpit).pdf (299.9 KB, 22 views)
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#8 Old 11-20-2017
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Quote:
Originally Posted by geophysicist View Post
I found where is the location of the reverse light and it?s power cable. It basically has similar power cable like the dome light, with 6 pin connector.



The problem is, I am not sure which one is the positive cable.

The wires you need are the Brown (earth) and the Grey/Yellow (Reverse positive - see the wiring diagram in my LED Reverse light thread)

Quote:
Originally Posted by geophysicist View Post
I tested the pin no 6, the brown cable, it is the negative one. The multimeter showed 12.xx Volt reading. I did this by tapping the black probe of the multimeter to the brown cable pin, while I tap the red probe of the multimeter to the positive end of the car?s battery.
That's one way to do it. However you won't test a positive voltage from the reverse switch that way so be wary of testing with a multimeter.

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