A friend gave me a Boss *Bass* Equalizer pedal (GEB 7 I think)? Is it okay to run this through a regular 6-string Strat, into a non-bass amp? Any chance of blowing or wearing out anything, in any setup?
It's fine. It just won't sound as good because it's designed for lower frequencies.
Itll end up boosting a lot of low end. Its fine to go if that sound works for your songs.