I'm not much of an electrical troubleshooter either, but maybe this will help get you started...
Does it pop your breaker (that's a breaker you're showing there... not a fuse) after the motor runs for a few seconds, or immediately upon pushing the button?
If immediately it could indicate a short-circuit somewhere... but if the motor runs a few a second or 2 beforehand, sounds as if the motor is requiring too much current... or the breaker itself is weak & needs replacing.
The breaker can normally be found at almost any auto parts store for a few bucks.
I'm sure the others will chime in later...
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