forgot to mention, the 7.5amp also runs powervalve servo, if you have runned bad oil its clugged with burned oil so the servo may struggle with pulling them making the servomotor work overload and blow the fuse, take them up, clean them and some new gaskets in, Cheers!
Thumbrule : if you need bigger fuse than comes stock, you have a problem, a bigger fuse just pushes the problem ahead and may make you're sled catch on fire..the wires on these sleds are not the thickest and if you go up on fusesize the amp you are pushing through will make the wires very hot...