sounds to me like you dont have the right amount of load to make the flasher relay work correctly.
if you have no led lights fitted and all are working i bet it is that some of the bulbs are lower wattage (used any motobike indicators?)
iirc a sierra used 2x 21w bulbs f&r and 5w repeater
the idea was when the bulb blew you could tell by the flash speed getting quicker
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