Before you start , do your headlamps , horn , dimmer switch , etc. work? There may be a problem at the 10 pin connector going to the switchgear . Don't worry about this yet.
Alright. It is time for you to start thinking . *
# 1 new flasher installed . still no flasher. Get your test light** and see a. w/KOEO , is there 12v at one of the flasher unit connectors ?
Y. apply 12v to the other connector (orange wire) to see if all the turn signal lamps light up. they should. If so you still have a bad flasher unit. Install a good known flasher and retest.
N . go back to F 7 and check for B+ at both ends of the fuse. B+ ? Y , the problem is between the F 7 and flasher connector.
* w/ea step , verify, verify, verify. You don't want to proceed until you are sure you pass/fail your current test. You don't want to waste your time rushing through this procedure.
** use a test light . Not a LED test light . You will learn about them later.