headunit wiring.
 

hey guys.
Iv got a mates supra and his headunit dosent work.
I figuared out the problem is its not getting any power from the constant wire?? the acc is gettting power.

Im assuming its a fuse/ hopeing its a fuse.
Where is the fuse for this wire in the supras its a 1995 supra btw.
Thanks Heaps in advance.
Duncan