I have a 2000 chevy blazer and I have a check engine light on that reads
P1875 4WD Low Switch Circuit Electrical any ideas what im looking for or maybe where to start?????

 

I created a new DIY thread with the book description, conditions, etc for this code: P1875 Explained

Sounds like you have a problem with the circuit between the VCM (under hood) and the TCCM (passenger side kick panel). You should start by checking the continuity from the TCCM and VCM on the wire specified in the schematic.