[trit21]

There is a voltage regulator for the alternators. I have a 2000 Tiara 3500 and the regulators is located on the forward bulkhead right at the day hatch to the engine room. What is the reading on the batteries with boat running at about 1200 RPM? Should be in the 13.8-14.2 range. Check the voltage read ins downstairs as well on the panel gauge and verify they match either the batteries or the gauges on the helm. There are some relays that will affect the voltage readings at the helm station.