battery light with codes
 

i have an 08 6.4. the battery light comes on all the time. i have codes p163a, generator circuit b, and p0620... the alternator is new and is charging. the other alternator is charging also. i can erase the codes and the light will go out. it comes back on in a minute or two.i can't find any info on code p163a on here or other sights. has anybody dealt with this problem...

thanks, ron