Vehicle & Technical > Discovery

Battery Charging Problem (Help)

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Lostboy:
This is a far more interesting problem than trying to get this 70V power supply thats sitting on my desk working!

Check the cable from the alternator to your main battery, that may have a high resistance. Also, it might be worth checking the split charge system - disconnect this from the alternator and see if the problem goes away, though if your getting 14.4 at the second battery this would suggest that's not a problem.

Use a multimeter and check the resistance from one battery negative terminal to the other batter negative terminal, it should be low, less that an ohm (and what you can measure accurately on a standard multimeter!) is good - though watch out, most meters tell lies when you measure resistances less than about 5 ohms. I'm wondering if it could be some form of body/chassis corrosion between the two earths of the battery.

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