buddy
two 4d's properly charged and maintaind will
keep you in the boonies indefinatley
SMB?
who installed the 4D's
how are they charging now
how are they wired
do you have a built in shore power charger
do you have a isolator
are they charged
are they dead
budget
I would suggest:
pictures, even bad ones will help us
pics of wires, under rig, batts, etc
current charging statistics
current battery voltage
lets find out what ya have
then we can go from there
bw