Having starter problems

New poster here.  I figured I'd try this in the hope that someone has encountered a similiar problem.

For the last 3 months, the electrical system in my S15 blazer has been going haywire.

To date, the starter and the ignition switch and a total of close to $800 has been sunk into "fixing" the problem to no avail.  I had a wire literally catch on fire after the car was serviced; thankfully the hood was open and I had water readily available.

When I turn the key, the lights fade (similiar to the battery being low on juice) and there is no crank.  I had the battery tested thinking it was bad, and it came back as a good battery and it also had a good charge upon the intial testing ... so the battery is not the issue.  I replaced the battery terminals too and that wasn't the issue either, although the problem "disappeared" for about 10 days after I replaced the terminals.

This happens when the car has been shut off for 1 minute or 12 hrs.  I had it happen to me last night, and after a few tries (10 or 12 turns of the key), I finally got a partial crank.  The next turn, it started.

I drove it today and haven't gotten it to start since.

I am at my wits end here.  Any suggestions would be highly appreciated!  And thanks in advance

Welcome!

Please keep general tech questions in general tech and new member introductions in the new member section.

Anyone wishing to help out with 95blazer's starter issue, please do so in the thread he created HERE.