By using alt temp as the controller for the alt you will have belt dusting issues unless you also have a serpentine pulley kit.. 226F is a fine alt temp limit but alt temp limiting is a bit risky in that if the alt temp sensor were to fail, and on occasion they do, you have no other means of controlling alt temp during bulk charging. By setting belt manager you;
A) limit belt dusting
B) know your max amperage and it will be more consistent
C) if adjusted correctly the alt will never get much above 210 - 215F and this means longer life..
D) have a double insurance policy and alt temp becomes your redundancy policy
Alt temp limit also tends to be jumpy and drops in steps and rebounds in steps and generally yields less output than just limiting the field for a more consistent max output. The newer regs use a more adaptive alt temp adjustment, as opposed to the old 50% all at once cut then back to 100%, but it is still a bit clunky and you wind up in a game of ping-pong up/down up/down etc.. Don't get me wrong the new adaptive temp sensing is far better than the old but I still prefer to set the alt up to not exceed 210-220F under normal bulk charging conditions.
None of these small case alternators are constant duty so they are not designed to run for hours on end at full output. Yes they are a lot more robust than a stock alternator but still not an industrial alternator... This is why a good set up includes belt manager (formerly called amp manager).. The 6 series 100A alternator will output about 80-83A at 190F thus it is best to set it up for a max output of right around 80A but 70-75A is a bit better as 190F is often a dream temp in most boat engine bays and the more likely temp will be over 200F during a long bulk charge......
