sparks while tapping into 12v

[aspec818]

Was trying to tap into the 12v at the driver panel and encountered sparks when removing the terminal. I had disconnected the 12v battery in the front and also powered the car down via the screen. What’s causing these sparks?

 

[kev1n]

did you disengage the HV battery from under the passenger rear seat?

 

[aspec818]

did you disengage the HV battery from under the passenger rear seat?

i did not. is this required anytime you remove a ground wire? I noticed the same sparking when removing my subwoofer and the ground connection.

 

[kev1n]

i did not. is this required anytime you remove a ground wire? I noticed the same sparking when removing my subwoofer and the ground connection.

yes for your safety, the HV is connected to 12V

 

[Gauss Guzzler]

Leaving it connected under the rear seat is roughly equivalent to leaving the engine running on an old-fashioned car.

You need to disconnect the battery *and* disable the charging system.

 

[NewbieT]

With the 12v battery disconnected the car’s inverter will be producing from the HV battery so the system will still be live.