I have searched throughout the forum. My 4 hi light is not coming on. I have 4 lo and 2wd. I am going to start with the switch co i went to advance, autozone and napa and they can not find the 2 button switch before 95. If anyone has replaced theirs is it possible to give me a part number and manufacturer. Thank You. I bought this 94 chevy blazer yesterday. it has the 4.3, automatic tranny. 2 button switch (4 hi & 4 lo)

 

I just replaced the switch that goes on the dash. That was not the fix. i just ordered the switch that goes to the transfer case. I replaced all the vacuum lines. I can not find another fuse box under the hood so the one in the cab must be it.

 

I had this same issue, I replaced the vacume switch on th transfer case, indicator light switch on front axle, 2 button switch on dash, and still didnt work, then I replaced the actuator under the battery, that didnt do it, went back over the vacume lines and found the vacume gang thingy(dont know technical name)was cracked, replaced that and have 4 hi and 4 lo and 2, if after you replace the switch on transfer case if that doesnt do it, it could be the encoder motor on the transfer case or the tccm under the dash, good luck.

 

Thank you, now that it is 40 degrees it will be a lot more tolerable to go looking for the problem. i will go looking for the vacuum thing you were talking about