I've been having problems with my Spirit R/Ts charging system...the volt meter started to give fluctuating readings and would some times throw a code 46. I replaced the alternator thinking that the voltage regulator was in the alternator, but then I found out it was controlled by the computer. I tightened down the battery cables and all was well for a while. But then the fluctuating readings came back so I had my friend (who has a shop) wire in an external regulator. I bought a complete kit, and my friend said it was a pretty straight forward installation. Well the work was done yesterday, and the car seemed fine. But today it starting doing the same thing, even with the external regulator installed. My buddy trouble shot the system and all seemed ok with the wiring. We tried a new voltage regulator and it didn't make a difference. We are both stumped now...