Parasitic drain on 12V battery

[Lovemyev]

Eventually MG CS will “join up the dots” and realise that they DO have an issue with a batch of T box components in these cars.
Unfortunately for us owners and the dealers, they follow down the same laborious and time consuming route for all parties.
Making numerous appointments to finally conclude with the same diagnosis of the patient.
Until somebody at the mothership decides.
“Hey…… I had one of those issues only last week and the T box was the problem” .
Until the penny drops - get a booster pack !.

 

[emmrecs]

It is stupid that like you people are having to consider boosters to get running again.

Not stupid, in my opinion, just careful!

I bought my Battery Booster when I owned my previous MG5, and never needed it! Now, having needed it at least four times with my S5 I'm only too pleased to have it available.

 

[Hallix73]

About to exchange my MG4 for a S5. I have always had a 12V Boost pack in the MG4, never had to use it. However sounds a lot on here with S5 have problems. Early days with MG4 it was common that the 12V terminals were slack after transit.

What is a T-Box????

 

[emmrecs]

T-Box = Telematics Box.

 

[T1 Terry]

Has anyone else tried the fix @Big L thought might have sorted his battery hassles before he sold it Parasitic drain on 12V battery
Makes sense to me

T1 Terry

 

[Hallix73]

T-Box = Telematics Box.

Thank you and quick AI googles gives me this. Understand now.
In electric vehicles (EVs), a Telematics Box (or T-Box) is an automotive onboard unit that manages two-way communication between the car and external systems. While standard in many modern vehicles, it performs critical EV-specific functions related to battery management and connectivity.

Core Functions for Electric Cars

• Battery Health Monitoring: Tracks real-time data such as state of charge (SoC), discharge rates, battery temperature, and voltage.
• Range Management: Calculates remaining range by combining battery data with external factors like traffic, elevation, and weather.
• Charging Logistics: Helps drivers find available charging stations and allows fleet managers to schedule charging during off-peak hours to save costs.
• Remote Control: Enables "connected car" features through smartphone apps, such as remotely starting climate control (pre-conditioning) or locking doors.
• Emergency & Security: Automatically triggers emergency calls (eCall) during accidents and acts as a GPS tracker if the vehicle is stolen.

 

[Hallix73]

Does the USB next to rear-view mirror stay active when car is locked and shutdown?
Is it safe to fit a dashcam to this supply?
I only want dashcam on while I'm in the car.
Thanks

 

[stevedee]

No, it powers off.

Yes its safe, but see my notes: Dashcam: power from 5Volts?

 

[Hallix73]

No, it powers off.

Yes its safe, but see my notes: Dashcam: power from 5Volts?

Thank you thats well researched.

 

[Ian Key]

Does the USB next to rear-view mirror stay active when car is locked and shutdown?
Is it safe to fit a dashcam to this supply?
I only want dashcam on while I'm in the car.
Thanks

I have my dash-cam mounted on the passenger side and the view of the road isn't compromised.

Just be careful where you mount it as it has to be out of the driver's line of sight.

 

[emmrecs]

I have my dash-cam mounted on the passenger side and the view of the road isn't compromised.

Just be careful where you mount it as it has to be out of the driver's line of sight.

Agreed, but in my case the camera is small enough to fit directly behind the rear-view mirror so is out of sight.

 

[stevedee]

Just be careful where you mount it as it has to be out of the driver's line of sight.

Why?

 

[MG Clive]

Why?

Because the Law says it must not obstruct the driver’s view of the road ahead.

 

[T1 Terry]

Why?

To film just what is happening as he is driving. That way, if some muppet hit him and then claims it was his fault, the camera will have recorded exactly what happened and can't be argued with .....

T1 Terry

 

[TimothyN]

I installed my first dash cam after I had a head-on collision, where I braked and was stationary before the impact, but the oncoming vehicle skidded and hit me. At the scene, he agreed that it was 100% his fault, which he later denied and we went knock-for-knock.

Never again.

(I did write to his employers telling them what a lying, duplicitous toe-rag he was and asked whether they really wanted him in a responsible management position, but I never found out whether that cold revenge paid off.)

 

[stevedee]

Because the Law says it must not obstruct the driver’s view of the road ahead.

OK, but that doesn't mean it can't be on the drivers side.

 

[MG Clive]

OK, but that doesn't mean it can't be on the drivers side.

Yes of course, all Ian said was to be careful where it's mounted, which is good advice.