Question about 1991 Mazda RX-7

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My battery drains overnight

I have a 1991 mazda rx7 and the battery keeps draining overnight. i thought the alternator was not charging it enough so i got a new one and replaced it but still the same thing and i have done this with two brand new batteries so im just not sure where else to look... and i know that no other lights or switches are left on so i am stuck please help...

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  • sideburnpdb Dec 10, 2008

    well the car's air conditioning doesnt work...and i was told that the previous owner took off some parts of the a/c system so im not sure what is not there but ill take a look...

  • nahomalex Apr 09, 2009

    The car wont start at all??? I have 1991 Mazda Rx-7 and i got it for a cheap price but now every thing is stoping to work. first the speed meter then the windows and now the car is not starting at all and i think it is a problem with the battrie or some thing in the electricas.

  • had5399 Apr 29, 2009

    I have the exact same problem with my '86. it started once then would not start again. like you, I changed out the battary and the altinator. it gets to the point of turning over but, doesn't

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Check and make sure the Air Condition cluch is disengageing, I had the same problem afew years back.

Posted on Dec 06, 2008

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My neighbour had the same problem. The dealer advised him to connect a 300mA mains adaptor to the battery over night to trickle-charge the battery. He was told the alarm system drains the battery.

Posted on Jan 13, 2009

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1 Answer

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If something is draining the battery overnight, you need to check each circuit for a short to ground. You also need to make sure the alternator is charging the battery when the engine is running by checking it with a meter.

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if you installed a new battery as well as a new alternator, it should not go dead overnight. if you have a short in the vehicle that will drain a new battery that rapidly, the cable would have been melted already. although, dome lights do have a tendency to drain batteries, but not overnight. use a multimeter to check the battery voltage while the motor is running. it should read above 13 volts DC signifying that the alternator is indeed charging the battery.

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I'll start by saying if a battery goes dead you should be able to recharge it without having to replace it.
If it goes dead overnight something may be draining it, or the alternator may not be charging enough.
A mechanic would check alternator output and check all of the circuits for a power drain.

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My 98 lumina has a constant power draw from somewhere. I just replace the battery and had the alt tested (it was good). I have to jump the dang thing every morning but if I drive it enough during the day...


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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You will burn out your alternator if you keep on doing this.The alternator is not a charger. If you have a dead battery you should always charge it overnight on a charger.To keep the battery fresh all that you have to do is disconnect the terminals.Yes this is normal because the car has clocks and alarms that drain power even when the key is off. If you let the battery set to long while it is drained it will not take a charge.

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battery needs a deep charge from a battery charger.if you drain battery to low the alternator cannot supply enough charge to bring battery up to full charge.

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My battery drains overnight


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1 Answer

Battery drains overnight


some time the radio will put a drain on the batt. if it has a short. pull the radio fuse, charge the batt. and let it sit over night to see if it drains.

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