ac compressor not engaging

[daveking]

Hi
I never had working AC.
I was told the aux fan was dead which it was.
Also the 50 amp fuse behind the other fuses was blown.
changed the fuse but it blew again.
I have just fitted a second hand fan and it spins up fine.
Now the problem is that the compressor does not engage.
I was wondering if there is a fuse for the compressor.
And i would like to know what voltage fires up the compressor
so that i can jump power to it.
Or does any body know what i could test to find out what could
be wrong.

Thank you in advance.

Dave king