Head Unit Problems

Alrighty, I drive a 1988 Mazda 323 GTX. The fusebox in the engine compartment just has 5 large box style fuses, and they are fuses such as Fuel Injection, ignition, etc. I have a 800 page Factory Service Manual so I know where the fuse boxes are, but yeah i just checked with a visual inspection, i'll go through every fuse with a multimeter this time, although replacing the headunit and audio fuses with different ones didnt help.

alright, i checked every single fuse in the box for continuity and they are all okay, even the mini one in the headunit is fine.

alright i'm pretty much about ready to just run a new wire to my battery and back to the yellow wire on the harness, and save me all this hassle. It would only take 5 minutes anyway.

sorry for the quadruple post, but it seems like you cant edit on this forum. Anyway found the problem the old kenwood stereo that was in before my Alpine didnt have the fuse directly on the headunit instead, little mini fuse boxes were placed on the wires. The box on the red wire was clearly visible, and I had already taken that out, but the box on the yellow wire was shoved way back in there and was not visible at all. Luckily i found it when i was pulling wires. Works great again now though, and i Thank you all for your help. I'll probably be back.