My experience with my 72B hazard switch is that it is an electrical hub for
all of the flashing lights, and a dirty contact can screw up the whole works.
I "fixed" mine by spraying it with an electrics cleaning spray, letting it
soak into the innards, and then rocking the sucker back and forth--a lot.
This is, of course, after popping the switch out and cleaning all of the many
connections. The cleaning helped, but the rocking eventually did the trick.
If the switch for the 73 is the same as the 72, it is somewhere around $60 to
replace via Moss. Cheaper to rock.
J Donoghue
72B
66 Mustang
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