Question about 2003 Mazda MX-5 Miata

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My miata battery drains all th time

My miata cannot sit for 1 day without losing battery power. I have replaced four batteries and still no end to the problem

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Try this link....you can also use a test light instead of an ammeter to see which circuit is draining the battery:
http://www.wikihow.com/Find-a-Parasitic-Battery-Drain

Posted on Jun 16, 2009

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Recently experiencing battery drain and it appears to be sticking relay with electronic door locks. When the key is used to lock and unlock the car doors, there is not a problem. When the electronic phob is used to lock the doors, the relay sticks and draws about 5 Ma to draw down the battery overnight. Who would have thought.

Posted on Dec 05, 2012

  • Peter Dec 05, 2012

    Recently experiencing battery drain and it appears to be sticking relay with electronic door locks. When the key is used to lock and unlock the car doors, there is not a problem. When the electronic phob is used to lock the doors, the relay sticks and draws about 5 Ma to draw down the battery overnight. Who would have thought.

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Losing power while just sitting for long times is normal for wet cell batteries. However, for a short period like that, sounds like there is a constant drain on the battery when you think it is not in use (something connected to the battery). When you are not using the battery, either disconnect the battery, trace the source of the drain and turn it off, or buy a trickle charger and attach it to the battery and plug it in. You should also do a battery load test to see if the battery is properly holding a charge.

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You can check with a 12v test light or an amp meter. If you take off one of the battery terminal ends, (preferably the negative) and run the test light or amp meter in series from the battery post to the cable end, see if it lights up.


If it does, then you will want to start pulling fuses one by one until it goes out. When it goes out, then that is the circuit that is causing the draw. If not, then the battery is bad, as it can't hold a charge.

The recommendation for maximum parasitic drain is around 30 mA (0.030 amp). A typical drain today actually falls into the 7-12 mA range, even though some vehicles do approach the maximum. Multiply the drain (in amps) by the time (in hours) the battery sits without being recharged. The result is the amount of AH consumed by the parasitic drain. The actual drain may be small, but over time the battery grows steadily weaker.

Just remember to keep all of the doors closed when you do this and disconnect the hood light if there is one, thanks

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Only way to completely empty tank is to remove it. there is about a two gallon space between the pump and tank bottom where condensation can build up. You can partially drain it by disconnecting the fuel line and turning the key on. The pump will empty tank (don't run the pump after fuel is mostly empty or it will burn out) Also make sure that hose is secure so that fuel dosen't end up on the ground. After you have finished, put the battery on a charger and bring it back to best charge...Alternator will not and cannot do that.

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