I think that you be looking at/for Briggs & Stratton motors and parts, rather than Snapper. A phone number for Briggs: 1-800-444-7774. Perhaps they will email or send you a diagram, or give you an explanation.

Are you sure you have the battery hooked up correctly? Not running backwards?

Walt Conner

Yes, a battery connected the wrong way, will spin the starter shaft backwards, but the gear will not run up to connect with the flywheel ring gear.
there have been a lot of starters replaced by folks who didn't realise the problem! The positive (+) cable must go on the + post on the side of the starter, and the negative (-) post must go to the frame of the machine or the starter housing. Of course, this is a simple way of explaining it and a simple test.

Plus it either blows a fuse OR burns out the charging system.

Walt Conner

If you weren't able to fix this problem you should check either the Briggs Starter Parts page (linked to below) or the Snapper Manuals page and search for the specific part. I'll post a link to that in the following post.

Here is a link that might be useful: Briggs Starter Parts for Mowers

Here is the link to the manuals page for all Snapper mowers.

Here is a link that might be useful: Snapper Lawn Mower Parts