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  1. Phil2025

    12v battery drops to 5v when connected

    The behaviour I described is as you say, when I first open the car, but when the main battery kicks in it charges as normal. The latest problem is unusual. It is out of my skill level now, so I need to speak to the garage. How I get the car there is another matter. I suppose it will take a full...
  2. Phil2025

    12v battery drops to 5v when connected

    Thanks for the reply. I think it was wishful thinking it might be as simple as a new battery. My car usually shows around 12.4v, but sometimes it dropped to 11.9v. I am wondering if the car hasn't been maintaining the charge. Time to call an auto electrician.
  3. Phil2025

    12v battery drops to 5v when connected

    I had my 12v battery replaced about a year ago but 2 days ago I came out to the car and it was showing 5v. I managed to unlock the car, but having removed the battery it was a healthy 12.9v. I charged it off the car and refitted it and checked the voltage, still healthy, but as soon as I...
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