I’ve seen the sequence different in another video. I believe they disconnected the high voltage, then completely swapped out the battery, and then re-connected the high voltage.
If it fails completely, you won't be able to "start" driving the car even if the high voltage has a charge. There is a trick though, inside the front bumper there is a plastic cover/cap, under the cap there are two battery leads, you can carry a tiny little 12v battery (Duracell style) in your glovebox. If your 12v every completely dies, you can use a tiny 12v to start the car from the bumper....sounds crazy but it works :)
@@TheCarGuyOnline how much wiggle room do you have with installing a new battery. I can’t use the Tesla OEM at the moment. Live far from a Tesla centre unfortunately. Does the battery have to fit exactly?
@@anastasiawhite7482I think autozone has comparably sized 12v batteries, if it fits and you can latch the frunk it should work (12v). The battery vent should already be in your car…and the battery just has a hole on the side for it. It would depend on the type of battery you buy whether it has a vent or not.
Two things about high voltage on EVs: I thought all HV cables were orange. Second, even though it's a connector, aren't you supposed to use electrician-grade insulated gloves when working with HV parts/cables? I think the battery pack is around 400 volts and 100+(?) amps. Insulated gloves are so you don't possibly electrocute yourself.
I believe this is because the DC to DC converter can put 12V power to the terminals, even when the 12V battery is disconnected. Don't want to arc/short things :)
probably he leave car for longer without 12V and for longer time it is more safe to avoid connecting + and - 12v because I do not see other reason or/and may be for reset faults?
@@TheCarGuyOnline Tesla may have changed the procedure. According to replacing the 12V on tesla's site, they now have you disconnect the first responder cable that is in the frunk.
Followed step by step on my 2020 M3 and it worked perfectly. Thank you!
I’ve seen the sequence different in another video. I believe they disconnected the high voltage, then completely swapped out the battery, and then re-connected the high voltage.
Great video! I like how you detailed each step and gave a clear view of what you were doing
Where can you find the replacement battery?
What happens if the 12 v battery fails. Will the Tesla draw on the main battery for power?
If it fails completely, you won't be able to "start" driving the car even if the high voltage has a charge. There is a trick though, inside the front bumper there is a plastic cover/cap, under the cap there are two battery leads, you can carry a tiny little 12v battery (Duracell style) in your glovebox. If your 12v every completely dies, you can use a tiny 12v to start the car from the bumper....sounds crazy but it works :)
@@TheCarGuyOnline how much wiggle room do you have with installing a new battery. I can’t use the Tesla OEM at the moment. Live far from a Tesla centre unfortunately. Does the battery have to fit exactly?
And do you need a vent ? I want to install this myself to save me from getting the Tesla towed 400km
@@anastasiawhite7482I think autozone has comparably sized 12v batteries, if it fits and you can latch the frunk it should work (12v). The battery vent should already be in your car…and the battery just has a hole on the side for it. It would depend on the type of battery you buy whether it has a vent or not.
Two things about high voltage on EVs:
I thought all HV cables were orange.
Second, even though it's a connector, aren't you supposed to use electrician-grade insulated gloves when working with HV parts/cables? I think the battery pack is around 400 volts and 100+(?) amps. Insulated gloves are so you don't possibly electrocute yourself.
Nice video, why do you have to disconnect the high voltage connector?
I believe this is because the DC to DC converter can put 12V power to the terminals, even when the 12V battery is disconnected. Don't want to arc/short things :)
@@TheCarGuyOnline Then surely you need to reconnect the 12v terminals BEFORE reconnecting the HV.
probably he leave car for longer without 12V and for longer time it is more safe to avoid connecting + and - 12v because I do not see other reason or/and may be for reset faults?
@@TheCarGuyOnline Tesla may have changed the procedure. According to replacing the 12V on tesla's site, they now have you disconnect the first responder cable that is in the frunk.
@ I think that might be on newer models, maybe 2021 and newer?