Mercury 50 EMI

[sharkydiver]

replaced diode but 20 amp fuse keeps blowing. tilt and trim works, as soon as you turn the key to start the fuse blows. The engine turns freely and was running after the mechanic changed the diode but the fault has re-occurred.
Can anyone come to my aid

[sharkydiver]

replaced diode but 20 amp fuse keeps blowing. tilt and trim works, as soon as you turn the key to start the fuse blows. The engine turns freely and was running after the mechanic changed the diode but the fault has re-occurred.
Can anyone come to my aid
Sorry this is my 1st time