Question about Mazda MX-5 Miata
Somewhere, you have a subsystem in the car with a short that is causing your battery to drain. The way to narrow this down is this:
Get a 12-volt light bulb (any bulb from a turn signal or something to that effect will work), and solder a wire onto each lug on the bottom. Disconnect the cable from the negative terminal of your battery, and place the bulb inline with it, so that it is "cable - bulb - battery" (connect one bulb wire to the neg battery cable, and the other to the neg battery terminal). The bulb should light up. This is because you have current being drawn through the car.
Now, go to the fusebox, and take out the fuses for the radio, the car's computer, and the clock (since these all have current drawn at all times). Now of the remaining fuses, remove one fuse at a time. Check the bulb each time - if it stays on, the fuse you have just pulled is not in the circuit with the drain. Put the fuse back and move to the next one. If you pull a fuse, and the bulb goes out, you've just broken the conduction circuit - you've found the system in the car that is responsible for the current draw, and have stopped it by pulling the fuse and opening the circuit. Whichever system or systems that fuse is intended to safeguard, that is where you must now troubleshoot.
I know it's only a partial solution, but it'll get you into the neighborhood of where the problem is, and once you get there, post up some more info and maybe we can take it further and figure out the problem.
Posted on Jul 28, 2008
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Posted on Jan 02, 2017
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