Voltmeter vs alt output

[peter555]

Please help I own a Merc 5.0 and the volt meter reads 10 v steady when idle and at 2k rpm. I have a dual battery system. Am I looking at a volt meter problem or is alt failing. Thank you.
Peter

 

[alldodge]

Might be a bad boat meter but the easy determination is with a hand held volt meter.

Place meter probes on the Bat and see if boat meter matches hand held

 

[Bondo]

Ayuh,...... My guess is, the charging system should be investigated,.....

 

[Scott Danforth]

Could be bad gauge, connections, alternator or all the above

Start trouble shooting with a DVM

 

[nola mike]

10v and you wouldn't be starting or (most likely) running. Like AD said, check voltage at the battery. If it's good you probably have bad connections at the helm

 

[ROY WILLIAMS]

Please help I own a Merc 5.0 and the volt meter reads 10 v steady when idle and at 2k rpm. I have a dual battery system. Am I looking at a volt meter problem or is alt failing. Thank you.
Peter

THE VOLTMETER VOM ELECTRONIC TOOL .. VOLT 13.75 -14.75 VDC ...ON THE ALTERNATOR POSITIVE ...
THE ALTERNATOR REGULATOR DIODES IS THE DAMAGED IT ..