Dodge Colt Vista Blows Ignition Fuse

My MIL owns an early 90s Dodge Colt Vista. The car has a history of blowing the ignition fuse. It used to do it on damp evenings. Then it went for a few weeks without blowing the fuse. Now, it blows the fuse within an hour.

We've taken it to a local mechanic. He can't figure out the problem and has given up.

I really hate this car and I wish she'd get rid of it. Unfortunately the money is quite tight.

Has anyone seen a problem with cars of this vintage blowing the ignition fuse?

Thanks.

Hi you might want to have the computer check mine use to do the same thing and I had to replace the computer after that it stop doing it