Good Evening, I have a 1998 blazer and I replaced to vacuum lines and checked all fuses. I still have no indicator lights on my 3 botton 4wd switch or any noise from the TCCM or the encoder motor on the t case? This has me stumped if anyone has information please help??. Have a blessed night.

 

Well since no one else has chimed in, and I'm having problems too, here's my suggestion.
Actually test voltage at the TCCM connections. I'm sure your's is like mine. So you will have the 4 pin and then the "tons of pins" connector. You should be able to find a schematic online. Check for corrosion.

Just an FYI, I tested everything, I have voltage, all new parts, and still I have no dash lights or AWD. I hate GM for this "we're gonna make your life easy" BS.