I installed a new AGM battery in my 1999 Nissan Maxima. The radio will sometimes get loud and then return to normal.

Fixing a car on your own can save some money, or you can damage your car. Find out what happens if the car's battery is installed incorrectly and how to fix it.

Fixing a car on your own can save some money, or you can damage your car. Find out what happens if the car's battery is installed incorrectly and how to fix it.

Q: I installed a new AGM battery in my 1999 Nissan Maxima a few days ago. The car starts and runs fine. However, the radio will sometimes get loud and then return to normal.

Q: I installed a new AGM battery in my 1999 Nissan Maxima a few days ago. The car starts and runs fine. However, the radio will sometimes get loud and then return to normal.

Q: I installed a new AGM battery in my 1999 Nissan Maxima a few days ago. The car starts and runs fine. However, the radio will sometimes get loud and then return to normal.

An AGM battery should not affect radio operation, so check connections and perform a hard reset. A "miracle" car spray promising six months without washing is unlikely to work on heavy dirt. A faulty ...