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Discussion Starter #1
Hi guys, I ordered a new flat bottom steering wheel to replace my round one on my 2018 GLA 250. I had a question on disconnecting the battery.

Do I have to unplug the main battery under the hood as well as the Aux battery below the dash?

Your advice is greatly appreciated!
 

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I would say Yes to disconnecting both. Although the smaller battery primarily powers the Eco start/stop system they're electrically on the same mutually-supporting bus.
 

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Discussion Starter #3
I would say Yes to disconnecting both. Although the smaller battery primarily powers the Eco start/stop system they're electrically on the same mutually-supporting bus.
Hey thanks for your reply. I completed the steering swap successfully. I ended up just disconnecting the main battery. It was A-Ok.
 
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