Ford F-150 four wheel drive not engaging after infrequent use on Ford F-150

Some Ford F-150 owners report experiencing issues with their four-wheel drive system failing to engage after infrequent use. A common reason for this problem is a faulty transfer case motor, which is essential for shifting power between the front and rear wheels. Additionally, issues within the transfer case assembly may prevent engagement, particularly if the indicator lights do not illuminate. Other potential causes include vacuum hose leaks, faulty dial switches, corroded wires, and problems with the differential or shift motor. To troubleshoot these issues, owners are advised to inspect the transfer case motor and assembly, check for vacuum hose leaks, and test the shift motor for functionality. Addressing these concerns promptly can help ensure the four-wheel drive system operates effectively.