Rear wiper won’t stop wiping

I have been messing around with the rear reg plate illumination lights because a bulb had gone but surely that can’t be the reason. I had to remove the wiper cos it’s super annoying driving in the dry with the rear wiper painfully scraping my rear windscreen. Any ideas? I’m just about to disconnect it for the time being.

I would say switch or relay, but because you have been working around that area I would check for any signs of damage to the wiring in that area.