So my 4x4 lights started lighting up one day kind of on a wet cold day about a week ago and I didn't worry about it till now the other day I went under the truck disconnected a plug next to the shift motor and cleaned it ,and then it worked fine... till today it started flashing again I did the same thing to the same plug and it worked but as I tried shifting into 4x4 all I heard was clicking and it wasn't actually engaging and it started flashing again any idea what the issue is?

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1998 Mazda b3000 all black 4x4

Do y'all think it's the plug or the shift motor that is what I have narrowed it too

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1998 Mazda b3000 all black 4x4