Harley sportster starter problem?

ive got a 76 harley sporter 1000 ironhead. the starter wont start the bike but it can be jumped with a screwdriver. just replaced one of the celanoids and idk what else to do or try. any help is greatly appreciated!
Update: also we get a clicking sound when we push the starter button which is why we(my dad and i) thought it was the celanoid. ill try cheching the wires. it was a craigslist buy. it worked when we drove it home and hasnt since
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