One of the main causes of blown fuses is that oil gets in the solenoid and drowns it out. There is a seal in the trans and also one in the solenoid. The trans seal number is 3060 CR, available from Napa. I dissassemble and wash out with paint thinner and hang it up to dry out. Clean up the contacts with 400 sand paper. To test, ground the case and apply 12 volts to the #4 terminal, if it clicks in and stays in it's good to go.
A 15 to 20 amp fuse should be fine.
Fred
