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Double check the polarity to be sure that is correct first. Then, are you sure that the starter isn't in a bind on the Bendix? It might be a defective starter. Getting hot has to pretty much one of two things...........either is has a direct short OR it is bound up and is hot from not being able to turn over for some reason. You might take it out again and try it on the bench and see if it spins freely that way. Not a good idea to run these over about 10 seconds and then let them rest a minute or so. IF you are holding the starter button down for long periods trying to start the set, it will get hot. HOpe that proves helpful here. Please get back to me if you need more as all follow ups are included in our fee.