Can you give step by step instructions on how to replace the battery in a 1990 Miata?

Answer 1

Mazda Miatas require a very specific battery, due to their size constraints. The most common replacement is the WestCo Battery (visit WestCoBattery.com).

It is a sealed battery and has small connections for hoses to be connected to vent outside the car. When replacing the battery, do so in a well ventilated area. If you are replacing a stock battery, the connection for these ventilation hoses may be in a different location on the new battery. Therefore, it is advisable to purchase a few feet of rubber hose to replace it if necessary.

The battery is located in the trunk, underneath the carpet.

• Use a small, 10mm socket or wrench to loosen and remove the battery cable connected to the GROUND (-) post.
• Use a small, 10mm socket or wrench to loosen and remove the battery cable connected to the Power (+) post.
• The battery is held down by a bar running across the top of the battery. Before you remove the bolt to take off the bar, note where the hold down bar is mounted inside the fender (there will be a few different holes).
• Disconnect the rubber vacuum tubing.
• Remove the battery.
• Replace the battery.
• Connect the ventilation hose to the new connections. Use the new hose if needed, make sure it does not get kinked.
• Reconnect the cross bar holding the battery down.
• Connect the Power (+) post and tighten it.
• Connect the Ground (-) post and retighten it.