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I know this is an old thread, but incase anyone has a similar issue.....
My MK did this same thing.. started to blow the Engine fuse.
Now what I found with mine was a fault in reverse switch on gearbox..
Motor would run fine until selected reverse.
I unplugged the wires.. no problem blowing fuse.
I made a jumper wire and connected the reverse light wires together, bypassing the switch.. not blowing fuses..
Connect switch again.. pop goes the fuse.
Hope that may help someone else with a similar issue..