clubcar ds

I was dealing with a rotational squeal progressively getting worse. Decided to jack up cart and remove rear wheels and found driver side break pads sticking. Resolved that which ended the squealing, however after putting both wheels back on and taking for a test drive I noticed a new rattling...

Just did my spring maintenance on our early 80's Club Car DS (oil change, new plug, air filter). End of last season it started sputtering/missing at all rpms. I discovered that if I push on the little black box beside the starter it runs perfect. (See pic) I believe this little black box is a...