If your flashers make the turn signals and lights work (often backup cameras are tied to backup lights circuit), it can be a sign of a bad or weak GROUND.
Why? Turn signals on many vehicle use the ground to switch on the turn signal lamps.
If you don't have a sufficient ground for your normal items, a turn signal can provide an alternate ground when activated. This also means more current is going through this circuit than intended, so it needs to be fixed.
Jon(MrE.) gave you a good starting point.
Joseph
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1976 Newell Classic (Sold)
Home Base: Riverside, CA
If anyone needs my contact info private message me and I will send it to you.
-Joseph-
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