Others will come along and confirm but I believe there are two Pulley Belt sizes. 5/8" and 1/2"? My 50' has the generator not alternator and 5/8" v-belt. Here is a picture of mine. What size belt pulley do you have? What Alternator set up?
You have an Alternator or original Generator? If you have a 5/8 V Belt set up with a generator pulley the NAPA belt size (picture above) should fit. But if you have an Alternator and not the stock generator pulley you will have to figure that one out. Good luck. Keep us posted. Pictures help.
There are different pulley widths for alternators available on Ebay. Lots of farm equipment runs a 5/8" wide belt and conversion pulleys for your alternator can be installed with nothing but an air impact wrench. Alternators don't use any kind of drive key on the shaft, just a friction fit.
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!
Try that battery powered impact on an 18 wheeler- - - - -1K ft/lbs with a 1" drive is about average for a 3/4" fine thread. Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!