Yes, I just covered all my car battery terminals and connectors with dielectric grease this week. The car would start fine, but the dash kept flashing the battery and brake lights, and the radio kept randomly going off.
Problem seems to be solved now, after lots of sanding, dielectric grease, and battery terminal sealer.
But if none of your turn signals worked, it doesn't sound like it was a turn signal light that is the issue. Would have to be the indicator bulb or the flashing unit, or possible the handlebar switch.