Voltage regulator failure?

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CharlieO.

Guru
Joined
Sep 21, 2020
Messages
1,763
Location
Lake Champlain Vermont, USA
Vessel Name
Luna C.
Vessel Make
1977 Marine Trader 34DC
Cruising back to our slip today I noticed the amp meter reading close to what my alternator is rated for(51a).
My USB plugs that also read voltage were at 17.5 volts. My DC2DC charger was reporting 17.5 volts feeding it.
I backed my RPMs down for the final 20 minutes to the slip and the voltage dropped to 17.

I immediately went to the engine room to check my batteries, they were not Hot and not showing any sign of distortion.

I am thinking it is a failed voltage regulator, does that sound plausible?
 

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