SS Beast

I had engine rebuilt about 5000 miles ago when after a few hundred miles my reverse didnt want to engage, but i was able to force it in. my bad. about two weeks ago my reverse light went out and turn signals went out. I replaced the fuse and it just keeps blowing them. I took it to the track last night and on my first run it was very hard to get it in second. Second run I grinded 2nd and third. Tried it one more time and did the same.