Possible electrical problem
 

ok so i have had my blazer for 5 years its a 2001 and about a year ago the 4wd light started coming on and off but not every time it only does it sometimes or it will every time i drive for like 4 days then wont for a month. the 4wd works when the lights not on and some times when the light is on it does, but my buttons dont light up i have taken the whole thing from the dash and made sure the wires are solid in the plugs. can somebody please help me?