hi, i`ve just fitted a lithium battery in a hybrid configuration,150ah,and on starting up the alternator temperature, steadied off at about 70c after about an hour,the alternator is a simple lucas type 127 70amp,i have two lead acid.The lithium battery was at 37 percent so was taking as much as the alternator could give but the alternator belt was screeching at cruising revs,the belt is tight,so is there anthing i can do to stop this screeching or should i upgrade the alternator to what?any help much appreciated,many thanks