Onyx, 2008 LL Bean 3.0R and 2017 Honda Civic Hatchback Sport Touring
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3,968 Posts
++ on the battery and ground issues. Check the negative lead to the battery. Corrosion is a tell-tale sign of a bad ground. I inherited a car that sat for 3 years after a new battery had been installed. The battery was wasted after sitting in the heat and cold without being used. Even if your multimeter is telling you it has over 12 volts, it may not have the cold cranking amps and might be impossible for the alternator to "keep up with."
