I have seen the fuses for these thing check good but actually be bad. Make sure to remove it when you check it. I got in the habit of wiggling the brass on both sides to make sure there's a good connection. You can also check voltage at the motor if you have it blocked up. Make sure the cables aren't crossed, it's easy to do.
Came back to edit. Saw that you check voltage at the motor and they were same as other side. Sounds like motors bad, but you replaced it. Not often you get a bad one. You can run the motor off of a battery charger if you wanted to make sure all is good.