I have this clicking sound in the right passenger footwell area and no electrical power to anything. Chevy said it may be a relay and that if I can get the Blazer to them, they will be happy to fix it. Any chance I can change the relay myself and save $$ and time? I have to charge the battery and try and start the car to drive it there...I'm a great nurse...but I need help with cars! Thanks in advance for any help! ShereeVT