300zx maybe wiring or fuses
 

(1991 300zx N/A)I'm not sure whats going on but check it, my stereo and wipers only work when my car's key is turned on half ways once i turn on the car or ON mode they both stop working like a shortage or something. The AC lights turn on but the AC itself dont work due to this "shortage" because i remember my stereo would go out along with my ac til finally they both stopped working while my car was on.. I wanna say all the fuses been checked and they all work except when the key is turned on. It be cool if you all could help and i would appreciate the solution or advice or comments=)

yuupp found the problem
 

it was just this thingy. found the problem.. thanx tho