mackandmaggie Report post Posted March 22, 2023 My 2017 Newmar with 6.9 cummins voltmeter fluctuates at startup about 10-12 times, then settles down to 13+ volts. This started a few months ago. Bought 2 new chassis batteries , cleaned and tightend all connections, and it still continues. Does anyone else have this issue. The rv runs great 14k miles. Don't know if is alternator voltage regulator. 40 miles from cummins office Share this post Link to post Share on other sites
dons2346 Report post Posted March 22, 2023 Welcome to the forum Mack. Are you now in a colder climate? It is possible that your intake grid heater is cycling on and off to adjust for the colder climate. It is also possible that the timer is failing. Doubt seriously that you have a failing alternator Share this post Link to post Share on other sites
bhalldorson Report post Posted March 22, 2023 I have a 6.7 cummins in a 2008 Fleetwood and it has always done this. We bought new and it never presented a problem so I haven't investigated. Fluctuation seems to last longer if it has been sitting for several days, but it always settles down after short period of time. Share this post Link to post Share on other sites
wildebill308 Report post Posted March 23, 2023 20 minutes ago, rayin said: I agree with previous replies. My old Dodge CTD 5,9 did that every time, but it always started in below 0°F weather.. I don't know for shure as I don't remember. I do remember that intake heater was a big load. Ray I just tryed to stay out of that colde of a place. Bill Share this post Link to post Share on other sites
mackandmaggie Report post Posted March 23, 2023 The rv is in fernandina Beach fl. Never been in cold weather or winterized. Freightliner couldn’t give me a definite answer. Just received the engine serial # and will get pdf for engine diagram Share this post Link to post Share on other sites
