Alternator output

[Alex_Blackwood]

Thank you, yes each alternator is charging a lead acid start battery which are connected together by a Victron cirex switch that appears to open and connect the two start battery's together when one is above a certain voltage ie alternator charging
I will test the alternator outputs and see what we are getting

If you can measure the output voltage of the Cirex with both alternators individually and both alternators together you should see if there is any difference between each of the combinations. Do the same at the battery terminals and see if any difference.