f150 alternator repair

got a ford f150 and im trying to replace the alternator, i got the top bolt out but the bottom one, when turned just swivels the alternator around, any help is greatly appreciated
Even without knowing the year and the engine size the bottom bolt goes tru bracket, alt, spacer and to engine. It's corroded up and use some PB or some penetrating type oil around and start working it free. Air tools can help with sticky stuff if you have those but just go easy with air with unkown force,

T
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Tom Greenleaf - MetroWest, Boston
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