2003 GMC Sonoma Owner's Manual - Page 310

Vehicle Storage If you're not going to drive your vehicle for 25 days or more, remove the black, negative (-) cable from the battery. This will help keep your battery from running down. . Batteries hurt can you. They dangerous ca because: They contain acid that can burn you. They contain gas that can explode or ignite. They contain enough electricity to burn you. If you don't follow these steps exactly, some or all of these things can hurt you. L-tferies have acid that can burn you andgas that can explode. You can be badly hurt if you aren't careful. See "Jump Starting" next for tips on working around a battery without getting hurt. Contact your dealer to learn how to prepare your vehicle for longer storage periods. Notice: Ignoring these steps could result in costly damage to your vehicle that wouldn't be covered by your warranty. Trying to start your vehicle by pushing or pulling it won't work, and it could damage your vehicle. 1. Check the other vehicle. It must have a 12-volt battery with a negative ground system. Notice: If the other system isn't a 12-volt system with a negative ground, both vehicles can be damaged. 5-47 Also, for your audio system, see Theft-Deterrent Feature (Non-RDS Radios) on page 3-71 or Theft-Deterrent Feature(RDS Radios) on page 3-72. Jump Starting If your battery has run down, you may want to use another vehicle and some jumper cables to start your vehicle. Be sure to follow the steps below to do it safely.