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I should have stated that I’ve already checked all the connections including the IGN signal to the charger. All good. I’m thinking that the pattern of it working for several engine start/stop cycles, then stop working, may be a clue to the problem.

I’ve had this charger working fine for 4.5 years. It just stopped charging when the engine is running, seemingly at random. The charger seems to charge after the house battery ground has been disconnected and reconnected. It will then charge when the engine is started the first time, then it...