85aet 1990 charge 2 batteries??

[angusjmac]

hi, how can i charge two batteries, starter and aux (house battery) with this outboard. according to info fed to me, alternator only produces 10amps. does the outboard have one of them aux (additional alternator ports)? or need i just use a change switch?

any help is much appreciated

thanks

Angus

Yamaha 85hp aet 1990 serial number 688 L 412659

[rodbolt17]

you can still use a battery isolator or a VSR type switch or even a manual 1,2 and all switch.
however at ten amps its not gonna be much charge.