The signal lights may not be working, because what ever crossed circuit you have going is overloading the flasher.
Possible filament in one rear bulb has crossed to the park light circuit.
Remove rear bulbs one at a time , till problem goes away.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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