Not getting enough charge voltage.
I sail a 1984 Tartan 3000 sloop. I'm currently living aboard and fine tuning her for a big cruise.
Here's my issue.
The boat is equipped with a 50amp Motorola alternator and two new group 27 wet batteries.
The batteries are discharged and reading about 12.10 volts with no load.
When I run the engine at about 2000rpms I get about 12.9 volts with the guest battery selector on Both. I get about 13.2 volts with the selector on battery 1 or 2.
According to Don Casey's book this voltage is inadequate for charging.
I'm getting 13.8 volts at the alternator. The alternator output wire joins the harness and travels back to the cockpit engine panel. When I read the voltage there it's 13.2.
I've tested the output wire for resistance and got a zero reading.
Does anyone have any idea why I'm not getting enough voltage? Is my alternator shot??? Should I install an new and larger alt output wire???