We killed Mercedes benz EQS 450 12 volt battery low won't start won't charge 😢 Fix Tutorial

Mercedes Benz EQS 450. We were doing 4 channels amplifier and 8 speakers. after 6 hours of trunk opened, it killed the 12 volt battery under the hood. measuring 6 volt and car won't start
This link is how to open the hood and get to 12volt battery
• Mercedes Benz EQS450 H...

[@ironbull429]

Duke you are very smart man. I love this video because when my wife get her Mercedes SUV this month. I will be bringing it to you first before I go to the dealership. I hate dealership. Well done job my friend. 😊💙👍

[@goautosound1]

Thank you 😊

[@juliekimrealtor777]

Great video

[@ironbull429]

Awesome job! 😊💙👍

[@goautosound1]

Thanks! 😄

[@Eisenhut1]

Two things. 1. The exterior lights are because of the parking light setting on the light switch. Check for the arrows and they show which side will light up. Should be on auto normally. 2. The battery is dead since you left the hood open. Then the DC/DC converter doesn’t function and charge the 12v battery from the HV battery. You essentially killed it because of two user errors.

[@goautosound1]

@@Eisenhut1 yes we did , because we had to use Testlight for connections at the amplifier and speakers. We couldn't find any information anywhere so it took long time to figure out,it all worked out at the end

[@youngmoon-tk4xh]

Why won't they owner to charge the battery?

[@goautosound1]

@@youngmoon-tk4xh because of high voltage battery. They only want dealer to do charging