Question about 1992 Subaru Legacy

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Subaru legacy power lose when switched off. new battery charge rate 14 volt+

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The charge rate of 14 volt shows that your alternator is responding as it should and is doing its best to recharge the battery. Even with a fully charged battery if you switch on the power hungry electrical items (main headlights, rear window demist heater etc) you should see the alternator respond by pushing out 14+ volts. A low battery will show about 12.2 volts when disconnected. OK you need to find what is draining your battery when the car is switched off. With the car off disconnect the negative terminal and measure the current flowing between the disconnected cable and the negative terminal, it should very very low, just enough to keep the clock running. If you do have residual current flow, remove and return each fuse one at a time and note each time the current reading. Quite quickly you will be able to isolate the circuit that is causing the drain. Often it is a lighting circuit for an interior light that you cannot see....such as a glove box light not going off when the lid closes or the trunk light staying on. These work by a contact switch being opened by coming into contact with a bracket when shut. If for some reason the bracket gets bent or is dislodged then the light stays on.

Posted on Jun 01, 2010

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