The cheapest way to find out (from a non technical, lazy a** like me

) is to check the battery first, take it to a autozone, napa or something, and have them check it, or just use jumper cables first.. if your sure that is NOT the battery, then check the rest of the stuff. BTW what car do you have age and miles? because i have driven previous cars way past 130k miles and never had much electrical issues, but the battery it self.