[Teefdoc]

Hello I recently got a 2019 BMW 440i (F36), and I'm now trying to install a blackvue dash cam with a dedicated battery (Cellink neo). The battery requires an ACC wire to the fuse box in the trunk, and a grounding connection. However, I'm having problem finding an unpainted bolt to ground the battery. Looking at the car battery compartment, there does appear to be some bolts used to hold the battery in place. Is that a good place to ground? Do you guys see anything else I can use? Thanks!

Images:

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[BulsaraF36]

Originally Posted by Teefdoc

Hello I recently got a 2019 BMW 440i (F36), and I'm now trying to install a blackvue dash cam with a dedicated battery (Cellink neo). The battery requires an ACC wire to the fuse box in the trunk, and a grounding connection. However, I'm having problem finding an unpainted bolt to ground the battery. Looking at the car battery compartment, there does appear to be some bolts used to hold the battery in place. Is that a good place to ground? Do you guys see anything else I can use? Thanks!

Images:

View post on imgur.com

I grounded mine where the fusebox nut is on the left.

[Teefdoc]

Originally Posted by BulsaraF36

I grounded mine where the fusebox nut is on the left.

The bolt is coated and the fusebox frame is plastic though :/

[BulsaraF36]

Originally Posted by Teefdoc

The bolt is coated and the fusebox frame is plastic though :/

see picture. I'm not having any issues.

[Teefdoc]

Originally Posted by BulsaraF36

see picture. I'm not having any issues.

Thanks for your help! I'll try it out.

By the way, are you also using a cellink battery? I see that you are tapping #143 (5A, powered window), using a 10A fuse. I only have 20A fuses from my add a fuse kit. Can I use that instead? If not, I think I will have to tap #162 (20A, for 12V accessories) which remains live for ~15mins after switching off my ignition.

[BulsaraF36]

Originally Posted by Teefdoc

Thanks for your help! I'll try it out.

By the way, are you also using a cellink battery? I see that you are tapping #143 (5A, powered window), using a 10A fuse. I only have 20A fuses from my add a fuse kit. Can I use that instead? If not, I think I will have to tap #162 (20A, for 12V accessories) which remains live for ~15mins after switching off my ignition.

I'm using blackvue ultra battery pack and since its hardwire to charge only when car is on I'm using 10amp fuse. in your case it should be fine to use 20amp.

[AK415]

I have it on a F32 but this may work for you as well

[Teefdoc]

I think I found a factor grounding point on the left side of the trunk (opposite to where the battery is located). Could you guys confirm for me? Thanks!

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[Billfitz]

If you need a grounding point drill a hole in any sheet metal, then drive a self-tapping screw. Just be careful you're not drilling where the bit or screw might hit something underneath the sheet metal.

[AK415]

Originally Posted by Teefdoc

I think I found a factor grounding point on the left side of the trunk (opposite to where the battery is located). Could you guys confirm for me? Thanks!

View post on imgur.com

Looks like a good contact point to me