When I turn off the truck and take the keys out of the ignition, my trucks electrical components such as fuel gauge and odometer is still on. The next day my truck’s battery is dead. Please help me find the cause. Thanks!
Most likely reason would be the ignition switch(not the key and tumbler) is not being turned off. This can be from a failing ignition switch. If the key lock cylinder has been recently replaced there may be a misalignment issue.
Ignition Switch Replacement1999-ford-f150-ignition-switch-removal-and-installation