Hi I have a 94' Chevy Blazer s10 4x4. I just replaced the tccm module and it went out on me in three weeks. I cant afford to get a new one for a while, and I want to go out on the lake Ice fishing with the 4x4. Is there any way to bypass it or manually turn it on. I herd somthing about running the vaccume line right to the transfer case? Any help would be great.thank you