Where is the starter relay located in the 2002 ford f150?

The starter relay located in the 2002 Ford F-150 is found by watching: https://www.youtube.com/watch?v=WetjBauPgrY You will come into problems with the battery during the life cycle of the vehicle. There can be a leak, causing the fluid to come out. The battery can just be completely out of juice. You will need to recharge or replace it at this juncture. A cracked case could arise and will need to be replaced completely. The battery can drain rapidly and will need to fixed. This part of the car will eventually become ineffective. The battery will need to be changed every 50,000 to 60,000 miles. It might cost some money, but you will have to cough up the cash to keep your car running.