Question about 1989 Toyota Corolla 2 Door

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Battery dead, alt. test making 75amps. But still drain battery.

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You must check the drain current on your battery after the engine is switched off. The best way to check this out is to connect an ammeter in series to the battery and check. there can be a permissible limit of few milli amps but a large drain can in about 12 hours ( overnight) fully drain the battery no matter how much you have charged it or the system charged it up.
Now discconnect one by one the ciircuits to centre on the faulty circuit and then the faulty device. This is easy as the fuse canbe pulled out one by one till the ammeter reading drops down.
Now it is always possible that directly connected circuits like Clocks, audio/video systems, remote control units , brake lamps park lamp circuits can be possible problem areas.
After the device is identified and battery must be charrged up fully and tested overnight.

Posted on Sep 01, 2010

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Posted on Jan 02, 2017

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Instead of guessing (could wires be crossed ) Testing the electrical circuits is the way to find the problem . Battery goes dead when ? over night ,while driving the vehicle ? If it goes dead overnight you have a parasitic drain on the electrical system . Look at a wiring diagram an check the wires for correct hook up . Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. Year , make , model an engine size . under system click engine then under subsystem click starting . Click the search button ,then the blue link . Really don't think you could cross the wire's ,only two size wires (connectors ) . only hooks up one way.

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The alternator may charge fine but could drain the battery through a bad diode,have you checked the alt for a bad diode?Disconnect the battery positive cable.Put a regular 12v test light between the battery positive post and the positive battery cable.If the test light is bright you do have a drain,if dim it is OK.A dim light may mean the drain is internal in the battery.If you do have a bright light remove a fuse ,one at a time from the fuse box until the light goes dim.Once dim you have identified the bad circuit.If removing all fuses do not dim the light,disconnect the alt charging wire at the alt,if that dims the light,then you do have a bad diode.DO NOT create a drain(bright light) when checking for the drain by turning on the key or opening a door/trunk etc.
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