my 1992 subaru 4 door legacy wont crank over I turn the key and just get a click

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I pulled the starter and had it checked it is in great working order, for the last year sometimes i turn the key and just get a click and sometimes it started, the last week i cant get it to crank over even with jumper cables.. all the lights work inside and out.. I noticed when it got hot outside the problem got worse, so where ever i went i had to keep the car running encase it wouldn't stat again .. so now it is parked in driveway. will not crank over, when it did crank over it started up right away .. i REPLACED the alternator, battery, and starter 3 years ago.. any help on what to check now would be greatly appreciated .. thank you