Has anyone found a fix for this?

The original Bose headunit was replaced with an aftermarket deck. But just recently the left side bose speakers have cut out to little to no sound.
Adjusting the balance to only the left side has no affect on the sound. Any suggestions?

 

you might have a blown speaker

 

I replaced my H/U only to find out ALL my left speakers were blown! Check your amp too

 

Both though at the same time?

 

yes unfortunately you might have blown one and it grounded out causing that whole side of the amp to blow

what radio harness did you use one with rca's on it or wire to wire