Quote:
Originally Posted by dblong
I have a 1997 Monaco Executive with the Cummins M-11. What should my alternator output be at idle?
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While I am sure there will be answers posted, even for your specific coach there is no single answer.
First, alternators put out less amps at engine idle speed than at higher RPM.
If the battery banks are discharged, that alternator output may be only enough to bring battery voltage up a little over what it was before starting.
Later/when the battery banks are charged, so not many amps are required (similar to float voltage for a smart charger) it should read around 14 VDC.
Basically, your battery bank demand will have a lot to do with your voltage reading, particularly at idle speed.