Turn signal flasher for '56

["bevacqua" <tonysru2@xxxx>]

Hello Fellow Owners,
When I got my '56 a week ago, the turn signal showed a flickering (constant
almost) light both at the four corners as well as the inside indicators,
instead of a definite normal signal. I figured it needed a new flasher, so I
replaced the 550 flasher with same type. After inserting it, and still
looking at it under the dash, I turned the ignition on and got a spark!! I
went ahead and put the turn signal lever left and then right, and it worked
like it should, all day. Two days later (today), I drove the car, and lo
and behold, NO TURN SIGNAL OPERATION WHATSOEVER!! I am not a mechanic in
any sense of the word, so I'm asking what could have caused this, before
inserting another flasher, and possibly blowing more $$$$$. Is this Heavy
Duty Flasher #550 (3 prong), 12 Volt correct, in the first place??? This
flasher says to use a 14 amp fuse in input lead. I don't see a fuse in
line, at all. This model doesn't have a fuse box, so it must be somewhere
back there, right?
Thank you very much for your help.
Tony