Hello everyone,I bought my wife a 98 S-10 Blazer LS w/113,000miles on it Friday and everything worked fine on the test drive. On Sat. cruise control and power mirrors fail to operate.Today I go out to fix those and now have no overhead lights and 4WD wont engage(no lights on 4WD switch). All of these things worked on the test drive and the night I bought it.I checked all fuses,and the box in pass side kick panel.Had some corrosion on 2 of the pins in the blue connector and cleaned both sides of that connection. Other than these things the truck runs and drives perfect. Is there a common connection that I'm missing, Thanks in advance.