Where can I find the Whirlpool dishwasher's wiring diagram to help troubleshoot the E4 F8 error?

You can usually find the wiring diagram in the dishwasher's user manual. If you don't have the manual, you can often download it from the Whirlpool website (www.whirlpool.com) by searching for your dishwasher's model number. Appliance parts websites also often provide wiring diagrams.