I fixed it so I can use other fuses untill I find the problem. Now I can use cheap 5 amps..
It worked ok for a short time, but now when the fuse blows and I try to put in a new one it blows immediately...the fuse connection has 12,6v all the time...someting must have burnt somewhere.
Before this new problem, the strange thing was that the fuse only blew when I turned the ignition off. Everything worked fine, but as soon I switched of the ignition and took out the key the fuse blew...Getting sick of this....