Another easy method , use a test light and test with it .
put the test light from the neg battery bolt to ground at the starter housing . Try starting the bike . IF the test light glows , you have a poor circuit / start looking .
same goes for the positive circuit . Go from the positive battery bolt to the positive terminal (stud) at the starter . If it glows , start looking .
A good test light is as good as ALL my Fluke meters and a lot cheaper to replace !