advice wanted

Howdy folks, Glad to see there's what appears to be a bunch of people from all over the world who share the same money pit of a hobby I'm falling into. I'm here to soak up just about everything there can be known about my new passion in bike restoration. Specifically regarding my 1975...

p/n 447-83350-70-00 is still in the bike and the signal directions work but wont flash. The unit offered by Mikes XS blows fuses when used and it looks like the availability for alternate replacements is limited and therefore pretty pricey. Possible I just have a wiring issue with the Mikes...