Hi,

I have had my TomTom Superior hardwired into the fusebox on my 2023 Scala.

The TomTom shows that it is charging when the engine is running, but after a few days it dies from a flat battery, as if it is using more power than it is getting.

Did anyone have any suggestions of what the problem could be. Thanks.

The only thing I can think of is that the Tom Tom is not shutting down when the ignition is turned off. Maybe it's been hardwired into the wrong circuit?

In the old days we had permanent live and ignition controlled circuits.

In modern cars we still have permanent live and ignition controlled but also circuits controlled on the canbus or by the car's CPU.

Thanks for the reply Aldfort. The TomTom does say it is shutting down when I switch off the engine, so i think it must be something else. Thanks again anyway.

Does the tom-tom battery discharge if it's disconnected from the car?

Having run a Tomtom device for years a few suggestions to try :-

1) I had a problem with a Tomtom 5200 remaining connected to my phone(and using battery) via Bluetooth behind the scenes despite being apparently shutdown. I stopped using Tomtom's bluetooth pairing.

2)They are also rather voltage and current sensitive (A cheap 12v/USB wouldn't charge mine properly) - Is it a proper Tomtom hardwire kit? Measure with a multimeter.

3)Also on a car with stop start and latest charging management that reduces charging to save a g or two of CO2 it can cause issues. I used to hear this with my previous Superb that sometimes had a cool box in the boot connected via a voltage controlled split relay (to avoid a flat battery!) that would turn off after a while when on a long run. I found if I ran with the headlights on this never happened.

I'd suggest plugging in a 12v device that has a voltage readout to have a look see.

Edited 22 July, 202522 Jul by bigjohn