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hedwards · 07-26-2018, 05:33 PM

Hi all; I have an unusual issue with my 2005 Newmar Mountain Aire; I am getting a check engine light which will change when I change the setting on the Dash Air control, You can't make this up, If I turn the airflow indicator to the off position all works just fine but if I turn it on with the engine running, the effect varies; i.e, i get multiple check engine lights up to and including the stop Engine Light at which time the engine will shut down.
Has anyone ever even heard of this before, if so i would be delighted to hear what the fix was

happy RVing everyone

Harry

ecurb74 · 07-26-2018, 08:31 PM

Wowsers! Air flow indicator? Compressor maybe? Is this happening every time you turn on the dash air or after running for a while. I’ll go out on a limb here and I know they’re two different animals, mine is a different make and an ISM, but I found that after running the dash air in real hot conditions I would lose voltage down to below 12volts after a few hrs. Found that the factory had put the alternator excite wire and the air conditioner compressor on the same re-settable circuit breaker. When the compressor kicked the breaker it would kill the excite wire which tells the alternator to charge. Not saying this is your case but it leads me to believe something is sharing with the air system and they don’t get along right now. The best thing to do is find out what the fault codes are. For what a Cummins dealer charges for one hour you can buy an instrument to read the fault codes. This would be my starting point. You can guess it to death but not knowing what’s making your check engine light come on you’re in the dark.