BlackVue DR750S-2CH Dashcam

[Deleted141006]

Has anyone fitted a Blackvue DR750 dashcam to a 2017 E Class saloon. I have one installed with a Magic Pro box to protect the battery from discharge. It is connected via 1 x switched and 1 x "permanent" fuses in the boot fusebox. Problem is that the dashcam switches off after about 80 minutes. Both camera and Magic box have been replaced. I suspect some conflict between MB electronics and the Magic box. Anyone else had this problem and if so what was the resolution. TIA

 

[CowleyStJames]

I have the 650 front and rear pair fitted to my 2011 E250 estate exactly as you've done and have no problem.
It'll just keep recording in parking mode until I start the engine again.
Yours is obviously a later model so perhaps there is a compatibility issue.
But I don't see why

 

[Deleted141006]

I have the 650 front and rear pair fitted to my 2011 E250 estate exactly as you've done and have no problem.
It'll just keep recording in parking mode until I start the engine again.
Yours is obviously a later model so perhaps there is a compatibility issue.
But I don't see why

Did you car have an additional battery in the boot end?

 

[CowleyStJames]

Yes. I have stop/start and have the smallest imaginable battery in the boot floor.
Looks like a motorcycle battery

 

[Deleted141006]

Yes. I have stop/start and have the smallest imaginable battery in the boot floor.
Looks like a motorcycle battery

I think that's the difference. I dont have the extra battery which I gather from others posts is used to provide the permanent supply to cam. I have tried getting info direct from MB but they dont seem to want to help for what they say is safety purposes and refer me to main dealer. I have already been to main dealer without a great deal of success. I guess i will have to try another dealer.

 

[richard]

Power magic pro cuts off either after a set time, or when battery drops below 12 or 12.5 volts (selectable). What is happening is your battery voltage is dropping below the threshold and it turns off. I'd guess that it is correctly set at 12v given you get 80 mins.

In my GLC I use a different circuit that cuts off at 11.5v or some hours. It always cuts after about 2 hours as battery has dropped below 11.5v. Using that saves buying a Power Magic Pro !

If you want longer then you need a Power Magic battery pack

If you use the little battery and the voltage drops on that then stop-start won't work until it is charged again. You shouldn't really use that. Delayed stop-start working may be perceived as a benefit!

Richard

 

[Deleted141006]

Power magic pro cuts off either after a set time, or when battery drops below 12 or 12.5 volts (selectable). What is happening is your battery voltage is dropping below the threshold and it turns off. I'd guess that it is correctly set at 12v given you get 80 mins.

In my GLC I use a different circuit that cuts off at 11.5v or some hours. It always cuts after about 2 hours as battery has dropped below 11.5v. Using that saves buying a Power Magic Pro !

If you want longer then you need a Power Magic battery pack

If you use the little battery and the voltage drops on that then stop-start won't work until it is charged again. You shouldn't really use that. Delayed stop-start working may be perceived as a benefit!

Richard

Power Magic is set to be on all the time and battery cut off voltage at 12v. Permanent supply fuse terminal is showing in excess of 12.5v input to the Power Magic when in parking mode but there is zero voltage output from the Power Magic after about 80 minutes. Both camera and Magic have been replaced and even tried in a car with basic electrics where it works as it should. So my reasoning is that there must be a conflict between the Magic and MB electronics.

 

[CowleyStJames]

I'm trying to remember what fuse the auto electrician used in the rear fuse box for permanent power, but I can't.
All I know is that I went away for three weeks to New England back in April/May and all that time the Blackvue recorded and the black magic box never shut the power down to it, so it never got near the threshold.

 

[Wheelnut58]

I have the same setup your on about, but with a Dr900 two channel,I leave it on all the time at work and it regularly stops on for 10-12 hour shifts no problems,I had it done at a local auto electrician who fits them for a courier company and knows what he’s on with.car is an A45.

 

[Gazwould]

Power magic pro cuts off either after a set time, or when battery drops below 12 or 12.5 volts (selectable). What is happening is your battery voltage is dropping below the threshold and it turns off. I'd guess that it is correctly set at 12v given you get 80 mins.

In my GLC I use a different circuit that cuts off at 11.5v or some hours. It always cuts after about 2 hours as battery has dropped below 11.5v. Using that saves buying a Power Magic Pro !

If you want longer then you need a Power Magic battery pack

If you use the little battery and the voltage drops on that then stop-start won't work until it is charged again. You shouldn't really use that. Delayed stop-start working may be perceived as a benefit!

Richard

11.5V isn't good , that's a flat battery !

 

[Ted]

My guess is that it isn’t a permanent live but a ‘battery protection’ circuit that it is tapped into (often used for glovebox/interior lights to stop them being inadvertantly left on)
I have deliberately done this on the Jeep and the dashcam stays on for 30 mins after it is locked.

 

[Deleted member 126251]

It is connected via 1 x switched and 1 x "permanent" fuses in the boot fusebox

That confuses me - have they now connected a switched and un-switched circuit in the car (through your camera) possibly causing the problem?

Why do they need two connection points. I'd have the magic box connected to the permanant supply and see what happens. Also although the camera is "live" it should been standby mode and only activate for bumps, movement etc and not run your battery down.

It is also not good for the longevity of a car battery (unless it is the 'deep cycle" type - which unlikely) to deep discharge it.

 

[Deleted member 126251]

In my GLC I use a different circuit that cuts off at 11.5v or some hours. I

You will be replacing your battery a lot sooner than you expect!

 

[Deleted141006]

That confuses me - have they now connected a switched and un-switched circuit in the car (through your camera) possibly causing the problem?

Why do they need two connection points. I'd have the magic box connected to the permanant supply and see what happens. Also although the camera is "live" it should been standby mode and only activate for bumps, movement etc and not run your battery down.

It is also not good for the longevity of a car battery (unless it is the 'deep cycle" type - which unlikely) to deep discharge it.

Yes it needs both switched and unswitched circuits to the Magic box. Once the car ignition is "on" the camera records all that it sees and stops approx 5 mins after switching ignition off. It then enters "parking mode" .In Parking Mode the camera monitors the vehicle’s surroundings without writing on the SD card. Then someone bumps into the car while it’s parked. Camera will record it, including the few seconds leading to the impact. The Magic box is also set to 12v to protect the battery from discharge.

 

[Deleted141006]

My guess is that it isn’t a permanent live but a ‘battery protection’ circuit that it is tapped into (often used for glovebox/interior lights to stop them being inadvertantly left on)
I have deliberately done this on the Jeep and the dashcam stays on for 30 mins after it is locked.

I have been trying to get this information from MB but they seem unable or incapable of giving me an answser. I'm 99% sure that the circuit does not shut down as I have run cabling to outside the locked car and even after 24 hours I am still getting over 12.4volts

 

[richard]

Power Magic is set to be on all the time and battery cut off voltage at 12v. Permanent supply fuse terminal is showing in excess of 12.5v input to the Power Magic when in parking mode but there is zero voltage output from the Power Magic after about 80 minutes. Both camera and Magic have been replaced and even tried in a car with basic electrics where it works as it should. So my reasoning is that there must be a conflict between the Magic and MB electronics.

Have you looked at the battery voltage after an hour (at the input to the power magic. and before it would cut off) ? I.e you'd need to run some wires out of the car to a meter (or have a meter that doesn't go to sleep). The battery may be dropping below 12v at 80 mins, or you may be on a circuit that turns off some time after the car is locked - which is true of most of the permanent feeds within the car, especially at the rear.

R

 

[Abb]

Why not remove the 'magic pro box', they seem to be more trouble than they are worth. Just a thought.

 

[Deleted141006]

Why not remove the 'magic pro box', they seem to be more trouble than they are worth. Just a thought.

Its needed to prevent full battery discharge

 

[Deleted141006]

Have you looked at the battery voltage after an hour (at the input to the power magic. and before it would cut off) ? I.e you'd need to run some wires out of the car to a meter (or have a meter that doesn't go to sleep). The battery may be dropping below 12v at 80 mins, or you may be on a circuit that turns off some time after the car is locked - which is true of most of the permanent feeds within the car, especially at the rear.

R

Yes i have done that many times and in fact i am 30 mins into the present test with the magic box outside the car. Checking it every 10 minutes

 

[richard]

Ok, is the voltage stable or dropping over time.
What happened at 12:40 (80 mins ..)