I tried this post in the Garage but got no response, so I'll try here too /forums/images/graemlins/smile.gif I am going to swap on a CS series alternator and am wondering how big of deal this swap is. I did a little research and found that I will need to get a conversion plug for my SI style wiring. Also in this research there was something about gettin a conversion plug with or without resistence built into it in order to energize the alternator and make it work right. It needs a minimum of 35 ohms from what I read. The article I found said that if you have a battery light in the dash, this serves to create resistence and you are ok. I do not know if my '77 Blazer has this, and I do know that if it does it is broken. How would one check the wiring to see if there is resistence in it? Any other comments on this swap in general? Thanks!