My MH has VDO gauge, it is reading just a little over 11 volt while running , today i started my coach and the battery read 11.7 volts, once i started the engine it dropped to 11.4 , i started the gen...
The simple way to test the alternator is to check the voltage at the chassis battery with the engine running and it should be about 14 volts. Do you have a multi meter?