In addition to wrightz28 suggestions, this is the season for additional amperage required to start the cars. That means that the battery cables need to be in tip-top condition. They may look clean on first inspection; however, the corrosion can be under the red insulators on the cables and even drift down into the cable itself. Pull the cables off and separate the two positive cables and use a brass brush to clean both sides with a mixture of baking soda & water (50-50 mix). If you see a foaming green substance coming out of the cable insulator, keep cleaning them until the foaming stops. The green foam indicates the soda water is neutralizing the acid on the cables. After you have the cables perfectly clean, dry them off and apply a good coating of petroleum jelly (Vaseline) on all the contact surfaces before reassembly.
The piggyback positive cable design was flawed from the get go and unfortunately we have to play with the cards that we are dealt.
After everything is clean and reassembled, take it to AutoZone for a battery and alternator test.
