my mitsubishi gt300 battery will not hold a charge....battery is new altenator is new
2 Answers
Parasitic drain. Look it up on YouTube. You have a circuit pulling more than 50 milliamperes which is draining your battery overnight. There are many videos on YouTube about how to find and fix. There are also videos on how to test alternator. I would do that also.
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My guess either bad grounds or possible alt is bad