I replaced my mechanical fan with a 16-inch electric fan and had some problems with pwer surges (when it kicked on) even with a 90 amp alternator ... until I installed double relays AND switched from circuit-breaker to fusible link.

All my info can be viewed Here

And, if you aren't fully aware about fusible links, Read This

~~ Alan Horvath
1954 Chevy Pickup
Singing his praises in the
Passing Lane