Tiffin diesel mysteries..............
2015 Tiffin Red diesel with Cummins engine and Allison tranny. All going well until I took in for 15k service at Freightliner. I had seen a dash Low Battery warning once upon starting. Diagnosed ...
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On my Cummins. First start of the day idle goes from 800 to 1000 rpm, low battery for 3 - 4 minutes (12 V. engine heater) then up to normal for the rest of the day.
I would guess your engine heater control is not turning off the heater as it should.
I would guess your engine heater control is not turning off the heater as it should.
