A volt meter will provide the simplest way to monitor your alternator output and battery condition.
A more comprehensive meter such as the ADVERC, DCM Mk.III-Digital Circuit Monitor can also be installed. This is capable of monitoring volts and amps over multiple circuts.
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Best regards,
Farron
Technical Sales and Service for Beta Marine, US Ltd. Minnesott Beach, NC PH: 252-249-2473 farron@betamarineusa.com