Ammeter pegged to plus on my 74 318 duster?

This is my second duster a 1974 318. Always worked on it myself redone suspension, steering parts, interior, carb and manifold, minor body work, and guages.
Always had some electrical issues (who doesn't with these) but I fired her up this morning and my ammeter was pegged to plus took a look over everything and nothing was standing out to be wrong. Alternator started squeeling and shut it off right away.
About 4 months ago had a small dash fire which seemed similar to this issue (hence the new guages) So, problem seemed solved.

Must be a short somewhere ANY clue what I should be looking for when trying to solve this issue?