
Battery Terminal Corrosion
Checking Battery Terminals
Most modern cars run on a 12 volt negative ground electrical system. If your battery terminals or contacts aren’t clean, you’re making it more difficult for the current to pass around the electrical system and you are likely to experience car battery problems.
Remove the terminal caps by first loosening the connector for the negative/ground terminal and then disconnecting the negative/ground terminal from the battery (refer to Disconnecting and Reconnecting Your Battery).
Second repeat the process for the positive terminal. Clean each contact post with a wire brush to get a nice clean metal contact surface. Do the same to the terminal caps, then reattach them by reconnecting the positive terminal first, and the negative/ground terminal second (refer to post on Disconnecting and Reconnecting Your Battery).
