Join Date: May 2014
Location: N. Central Florida
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Sometimes a battery can "test" good but still be mostly dead in service.
BUT....this sounds more like a loose connection, at one end of one of the main battery cables.
You need a voltmeter to chase the battery voltage and see where it disappears.
Attach the negative meter lead to a good metallic ground....NOT to the negative battery post.
Sometimes the bad connection is between the negative battery post and the frame.
P.S. Welcome to the forum.
Please don't ask the same question in more than ONE sub-forum.
I deleted your other two.
Feel free to add additional details in this one.
'17 Prius C-4
Last edited by Easy Rider; 01-23-2019 at 03:08 PM.