I would look at the battery next, drop it off at a local auto parts store and have it checked and charged if it is good. I would also look into the battery cables. They are known to corrode under the insulation causing bulges and eventually it will eat the copper away. It is also a good idea to upgrade them to 2 gauge cables...

You may also want to clean the chassis to trans ground strap under the drivers side of the car.

If you have very thick jumper cables....you can run the positive one to the starter and the negative one to the chassis...this will tell you if your cables are bad...and not the battery

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