intermittent turn signals

[GL1200MARTY]

hi,
I bought a 1984 gl1200 standard and the turn signals work some of the time.

I have the shop manual and it says to check the sub fuse but does not say where its at.

if I ride the bike for 2 or 3 miles the turn signals start to work sometimes.

trying to find the fuse to see if it has connection problem first as that is what the manual says to do.

any ideas ??