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Intermittent Problem 12 Volt Battery

I have a 2001 Toyota Prius with an intermittent problem with the 12 volt battery. When not used for one day I find the 12 volt battery depleted and requiring a jump to start the car. The car then performs normally for perhaps several days, before the problem repeats. The 12 volt battery has been tested and found to be OK etc. Apparently, on an intermittent basis, there is a slow draw on the 12 volt battery. Any informed help with this problem would be greatly appreciated and thanks !

Reply to
casagiannoni
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You have an ignition off current draw (IOD) that exceeds the capacity of the battery. Since you have had the battery tested, the IOD is the issue.

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Reply to
casagiannoni

Please d "You have an ignition off current draw (IOD)".

He never said it was intermittent.

Reply to
Elmo P. Shagnasty

Please clarify "IOD". What could be the cause of the IOD ? Why is it intermittent ?

On possible cause of intermittent current drain would be an overhead lamp switch that is adjusted at the margin.

Reply to
Al Falfa

If the non-start condition is intermittent it may be that the IOD is constant but in some cases the 12V battery is not fully charged when the IOD commences, or the IOD period is longer or shorter, such that it does/does not deplete the 12V battery to the level that the non-start condition is triggered.

You will have to find the IOD. Never easy. Good luck.

I would start with any aftermarket electronics that may have been installed.

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