Which fuse to tap for Cellink / Blackvue battery?

[psun786]

Which fuse did you guys use to power Cellink / Blackvue external battery? Preferably one can provide 10 amp to charge the battery. Someone mentioned 146 exhaust flaps, but would it interfere with its function?

Thanks!

[Encanto]

Please search... there is a nice install contribution thread with photos in this forum.

Originally Posted by psun786

Which fuse did you guys use to power Cellink / Blackvue external battery? Preferably one can provide 10 amp to charge the battery. Someone mentioned 146 exhaust flaps, but would it interfere with its function?

Thanks!

[psun786]

Originally Posted by Encanto

Please search... there is a nice install contribution thread with photos in this forum.

Thank you. I searched before posting and found some are using 146 but not sure if battery's 9 amp draw will cause any issue for the exhaust flap in the long run. BTW, I don't want to tap into any fuse that stay on for 20 mins after ignition off so my choice is kind limited.

[Encanto]

Originally Posted by psun786

Thank you. I searched before posting and found some are using 146 but not sure if battery's 9 amp draw will cause any issue for the exhaust flap in the long run. BTW, I don't want to tap into any fuse that stay on for 20 mins after ignition off so my choice is kind limited.

Fuse 125: https://f80.bimmerpost.com/forums/sh...30&postcount=1

[frankzlin79]

Originally Posted by Encanto

Fuse 125: https://f80.bimmerpost.com/forums/sh...38;postcount=1

Wrong. Fuse 125 stays "on" for another 6-10 minutes even after ignition is killed. So this fuse will still be drawing power from your car's battery and give a "Battery Discharge" on your dashboard when you park.

I speak with experience as I have my B-124 connected to Fuse 125 and I monitor the battery with my Blackvue app. When I turn off the car (push STARt twice) the app reports "Charging", which means Fuse 125 is still charging my B-124 (note the car is off, and alternator off). After 6 minutes, the app will show the B-124 as "Discharging", which means the car has turned Fuse 125 completely off, and the B-124 power kicks in to charge the dash cam.

Using Fuse 125, every time I park the car, I get a "Battery Discharge" warning.

I am still looking for a trunk located fuse that turns off IMMEDIATELY when ignition is killed. Which fuse number accomplished this goal?

[milk242]

Did you read this thread?
https://www.bimmerpost.com/forums/sh...php?p=24164103

He outlines some fuses that turn off right away

[Encanto]

Your “Battery Discharge” problem is not from fuse 125 staying on. That’s a symptom of a battery or charging problem. Quite a lot of the car systems stay on for up to 15 minutes, including the OEM amp.

I’m using fuse 125 for my Blackview, no discharge prompt.

Originally Posted by frankzlin79

Wrong. Fuse 125 stays "on" for another 6-10 minutes even after ignition is killed. So this fuse will still be drawing power from your car's battery and give a "Battery Discharge" on your dashboard when you park.

I speak with experience as I have my B-124 connected to Fuse 125 and I monitor the battery with my Blackvue app. When I turn off the car (push STARt twice) the app reports "Charging", which means Fuse 125 is still charging my B-124 (note the car is off, and alternator off). After 6 minutes, the app will show the B-124 as "Discharging", which means the car has turned Fuse 125 completely off, and the B-124 power kicks in to charge the dash cam.

Using Fuse 125, every time I park the car, I get a "Battery Discharge" warning.

I am still looking for a trunk located fuse that turns off IMMEDIATELY when ignition is killed. Which fuse number accomplished this goal?

[frankzlin79]

Originally Posted by Encanto

Your "Battery Discharge" problem is not from fuse 125 staying on. That's a symptom of a battery or charging problem. Quite a lot of the car systems stay on for up to 15 minutes, including the OEM amp.

I'm using fuse 125 for my Blackview, no discharge prompt.

Encanto, what year is your car?

Mine is a 2018. And i have the "Battery Discharge" error every single time I park the car if I'm using Fuse 125 to power my B-124.

I took a volt meter to Fuse 145 (there is a 15 amp Fuse in that location from the factory). When I turn off the ignition, Fuse 145 IMMediately shows no voltage. Bingo.

I connected my B-124 to Fuse 145 using a 20 amp fuse that came with the B-124, connecting the 20 Amp fuse furtherest away from the prongs of the fuse tap. I inserted the factory 15 amp fuse closest to the prongs of the fuse tap.

In my photos, standing at the rear of the bumper, Fuse 145 is on the far left, third from top. It's the fuse that is empty in my photo, but holds a 15 Amp from factory.

I opened up the app that monitors the B-124 battery status. When I turn the car on, I see "Charging" and DC input of 13.0 v—which means my car's battery is charging the B-124. When I shut the car off completely (hot Start Twice), about 3 seconds later, the app reports "Discharging" and shows DC input of 0 v—which means my car battery is no longer powering / charging the B-124.

Thus, this shows that to be safe, we should be tapping into Fuse 145 to avoid the "Battery Discharge" issue I'm experiencing. I know that people have had success with Fuse 125, but maybe that's because your model year is different and you have older software. But for a 2018 M3, I can confirm that Fuse 145 is what you should be using to tap power for either a B-124 or Celllink Neo.

[Encanto]

My M3 is a MY2018 as in my profile.

You may have a battery/wiring/voltage/error memory problem that fuse 125 is making worse. The fact that using a fuse slot that is empty (no OEM module is being powered by that slot), and a sudden, less than 10A draw from that empty slot triggers a battery voltage error prompt shows that there is something not correct with this slot and the voltage level of the battery.

The F8x battery is Li-ion of about 70Ah. It really needs a long-term sustained current draw to be drained, or a long-term not charging period to be so weak that an immediate current draw will trigger the error prompt.

I would check the battery condition at the dealer if I were you.

Originally Posted by frankzlin79

Encanto, what year is your car?

Mine is a 2018. And i have the "Battery Discharge" error every single time I park the car if I'm using Fuse 125 to power my B-124.

I took a volt meter to Fuse 145 (there is a 15 amp Fuse in that location from the factory). When I turn off the ignition, Fuse 145 IMMediately shows no voltage. Bingo.

I connected my B-124 to Fuse 145 using a 20 amp fuse that came with the B-124, connecting the 20 Amp fuse furtherest away from the prongs of the fuse tap. I inserted the factory 15 amp fuse closest to the prongs of the fuse tap.

In my photos, standing at the rear of the bumper, Fuse 145 is on the far left, third from top. It's the fuse that is empty in my photo, but holds a 15 Amp from factory.

I opened up the app that monitors the B-124 battery status. When I turn the car on, I see "Charging" and DC input of 13.0 v—which means my car's battery is charging the B-124. When I shut the car off completely (hot Start Twice), about 3 seconds later, the app reports "Discharging" and shows DC input of 0 v—which means my car battery is no longer powering / charging the B-124.

Thus, this shows that to be safe, we should be tapping into Fuse 145 to avoid the "Battery Discharge" issue I'm experiencing. I know that people have had success with Fuse 125, but maybe that's because your model year is different and you have older software. But for a 2018 M3, I can confirm that Fuse 145 is what you should be using to tap power for either a B-124 or Celllink Neo.

[frankzlin79]

There's nothing wrong with my battery. I think in the 2018 car's, the software is programmed to report Battery Discharge if it senses non-OEM electronics drawing power while the alternator is off.

There's no way that my 9 amp battery discharged the battery like that in like the 10 minutes the car battery was charging my B-124.

[Encanto]

Again, I have a 2018 M3, Blackvue connected to fuse 125, Arc Audio KS 125.4 aftermarket amp connected directly to the battery... no "Battery Discharge" prompt anywhere. The OEM alternator is mostly off off even when driving (IBS).

Moving on. Nothing to see here.

Originally Posted by frankzlin79

There's nothing wrong with my battery. I think in the 2018 car's, the software is programmed to report Battery Discharge if it senses non-OEM electronics drawing power while the alternator is off.

There's no way that my 9 amp battery discharged the battery like that in like the 10 minutes the car battery was charging my B-124.