The battery in located in the trunk, and the positive terminal is the one that is slightly larger and labeled with a + sign.
To install a battery kill switch in a Mazda Miata, first disconnect the negative terminal of the battery for safety. Next, locate the battery and cut the positive cable where it is easily accessible. Connect one end of the cut cable to one terminal of the kill switch and the other end to the second terminal of the switch, ensuring secure connections. Finally, mount the switch in a convenient location, and reconnect the negative terminal to complete the installation.
In the trunk.
trunk right side.......
is it under seat
http://www.batterymart.com/p-12v-mazda-miata-battery.html this should help
Easiest way is to disconnect the positive terminal on the battery for a couple hours. This resets the computer log and the light will stay OFF until the problem occurs again and trips the light back ON.
It's in the trunk on the far right side.
In the trunk, passenger side
Trunk right hand side
well, the battery is in the trunk. you need to remove the strap that holds the battery in, after, remove the negative then the positive terminal. wah-la! its out :D reverse to put it back. if needed, clean with baking soda.
The battery is a Mt-MX5. This is a Interstate battery part#. fits 1990-2008 Mazda Miata. Go to interstatebattiers.com to find a dealer near you.