Quote:
Originally Posted by 2022M550i
Jcal - I've heard that too about hardwiring to the battery in the trunk. There are two batteries in my car. The manual suggests using the posts in the engine bay to charge the batteries. The front charge seems to be working, but now I'll test the battery in the trunk.
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Yes, I also follow the manual and connect to the posts under the hood only.
I have a copy of the workshop service manual for the G30. It has some interesting information regarding the battery.
One thing I am going to check is that my Battery Tender maintains a constant charging voltage of 14.8 V.