Third possibility , fuse , the 4 way flasher has it's own fuse.
So find and check the fuse , then you should be able to swap the turn signal flasher and the emergency flasher to test the operation.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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