My rear wiper is coming on when I turn the lights on? Is this because of a bad earth maybe? Anyone else had this?

 

hi
sounds like a earth problem unless you have been a the wiring and not put it back right
mine was an earth problem when i used my high beam flasher my rear lights went out redone the earths and problem went
you could check the connections to the switches under the steering cowling make sure there in right why your there pop them off and give a squirt of wd40
mark2