This past summer, I replaced the plug on my pool cover pump and it had been working just fine until recently. I noticed the GFI was tripped, but whenever I attempted to plug the pool cover pump back into the outlet, it would trip again. I opened the plug and everything inside was still attached, so don't know what my problem may be. I am NOT an electrician, just a retired Grammy living by herself and willing to take on most problems. Any suggestions?