OK , ive just got an NC fairlane , the stereo , windows , mirrors and horn dont work , the last owner siad it was a fuse ( changed the fuse in the fuse block to one i know worked , didnt change anything ) i changed the acc. relay to one i know worked , no go , messaged him and asked if it was like it when he got it and he said it went like it before and he got it fixed , and it was a fuse under the bonnet .

where the eff is this fuse ( or im thinking maybe a relay )

( yes i have used the search function ) thanks in advance movers and shakers

check under coolant tank & beside battery

did you solve this problem
look for fuse links instead of just fuses as they feed to the fuses located near the battery about 5 of them and look like a soft wire with connectors to allow them to be connected to different wiring circuits.
test with a test light for power to both ends.