Alternator not charging

[Jacana]

I have 2 Yanmar's and noticed yesterday the house bank is not being charged when either or both are running. When I start engines the alternators charge for approx 30 seconds and then stop charging. Any ideas why. Thanks Geoff.

[Stu Jackson]

Are you plugged into shorepower? Are the batteries full?

[MikeFergie]

What type of boat ? A leopard cat ? If so mine has cole heresy solenoids that when you start it first charges the starter batteries then when they are full moves to house batteries

[Jacana]

Not plugged into shorepower.
Have separate alternators for start batteries.

[Jacana]

Next Step Regulator -state indicator and error indicator both light up after about 30 seconds of starting engine and then no charge going into battery bank .Previously about a year ago it wasn't charging and replaced finder 12 v fuse.Fuse still looks good ???

[shane malone]

bad ground but i would start buy checking the connection on terminals first vary Doubtful both alternators would quit at the same time Should be a small problem just may be hard to find

[Jacana]

Plugged into 240 volt and battery charger works and charges battery bank.Still can't find why regulater cuts out after 30 seconds upon starting engines.