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Hello and thank you for your question.Can you please tell me what year your Ranger is please?
The light flashing means the system is setting and storing a fault code and or codes. If you can scan the system and post back with the fault codes I can advise you from there.
Yes I understand that but can you scan the system and see if there are any fault codes setting in the 4x4 module?
A code P1865 normally indicates a problem with the contact plate power circuit. This is the Yellow (YE) wire at pin 2 of the 6 pin transfer case shift motor connector C350A. This wire will normally have a pulsing voltage of about 0-9 V when cycling the key on. Thats the code I would deal with first. See the steps in the link below. Copy and paste the link to your browser to open and view it. Start your test at pinpoint test I1.https://dl.dropboxusercontent.com/u/104923897/Pinpoint%20test%20I1%20Mar%2030.pdf
Take a look at the wiring diagram in the link below, power to the transfer cases motor comes from the relay in the Aux relay box.https://dl.dropboxusercontent.com/u/104923897/Transcase%20Mar%2031.pdf
Okay , I rechecked it and thats the gas engine system, and the wrong diagram. For your 6.4 they are located in the under hood panel . See the links below .https://dl.dropboxusercontent.com/u/104923897/Hi%20Lo%20relay%20Mar%2031.pdfhttps://dl.dropboxusercontent.com/u/104923897/Relau%20Loacation%20Mar%2031.pdf