I was having a problem with the starter not working when engine hot so installed the bosch hot start relay kit worked for about a week now the 15 amp fuse blows when I turn the key. Any ideas?

Starter solinoid shorting out or starter going bad!

If the fuse is between the battery and the starter itself, 15A is way too small. There's a reason the big fat battery cable doesn't have a fuse on it...

If the fuse is on one of the smaller wires, then you have a short somewhere.

--DD

It is the fuse in the bosch hot start kit. Between the relay and the starter solenoid I just replaced the starter a few months ago so I assume that it is ok I am thinking a short somewhere