I was installing a new HU to my 5th gen when I realized that the 12v always on wire was dead. The ignition toggled wire is fine, however. I am completely new to car modding and I have no idea how to dignose this power problem. Can anyone help me trace the wire backwards and help me figure out which fuse it corresponds to.

 

its probably the radio fuse

 

I didn't see a fuse labeled "radio" inside the car or underneath the hood, do you know where that fuse is? I assume this particular fuse is of type "bat" not "ign" nor "acc", correct?

 

it should be in the fuse box under the steering wheel.