my transfer case just stopped engaging. no dash light indicator for 4X4. 98 4.6 4X4. tapped the engagement motor & then the 4X4 light came on but no 4/hi/lo indicator light & 4 wheel drive still not working, 4X4 light didnt go back out when i put back to 2 wheel high until i turned the truck off & started it again. any help is appreciated