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99 grand marquis electrical/running issue

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    99 grand marquis electrical/running issue

    Hi all,
    I am new to the forum and am having a very frustrating experience with a 99 grand marquis. at what seems to be total random the car will blow fuse #12 in the under hood box and die. it happens mostly on hot days with the a/c on. the problem is occurring more and more often. I have inspected all of the fuse box and relay box connections as well as all of the pcm grounds. all were fine. i have a very detailed wiring diagram but i don't know what to check. I am at my wits end.
    please help!
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