aux battery charge or not ?

[mtdave2]

im kind of puzzled here

my aux battery wasnt getting a charge. id meter it and it would be a 12 or less with the truck running... i checked every thing, didnt find a thing. i did replace that relay under the aux box...

now it meters at 12.98 when the truck is running... the main battery is at 14.05 .... wtf? is this normal? i would thing both should be getting the same charge.

btw the new internal alternator kicks major ass! easy conversion