wiper motor

hi noticed my wipers didnt work the other day on my 82 golf, gave the motor a few wacks n off they went only prob cant stop them wiout turning engine off, im guessing its the relay just thought id check wi u guys b4 i start stripping it down, only works on full speed intermitent doesnt work any ideas guys thanks

probably the park switch on the motor is sticking, give it all a good strip down and regrease, could probably do with it :-)