what needs to be replace on the 2002 explorer front wipers won't stop
Pull your wiper relay. That should stop it from being on when you don't need it. I would then try replacing your wiper relays. You may have one stuck closed. If you replace the relays and the problem hasn't gone away, you will have to replace the wiper switch.
Search Ford Explorer Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Ford Explorer Experts