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Likes: 
I got one here where even the dealer is at a loss. 2 visits from chrysler reps and even a special chrysler engineer visit still no work
the back story
ram 5500 totally stock never had a thing done to it besides service. Truck does a lot of towing and has racked up 24K miles since we bought it new a year ago. (yes 2018 left over)
so now we have battery saver mode. and for those of you that don't know, it shuts off the radio, disables high beams, AND EVEN KILLS TRAILER BRAKES OFF
Troubleshooting:
disconnect charge and test batteries: done both tested okay but not perfect
leave truck with nothing plugged in and batteries disconnected overnight left batteries on float charger still did it within 5 minutes of start up
brought to dealer (warranty)
tested and found both batteries okay, left sit overnight again and got same result, dealer replaced both batteries No Change
Dealer has 3 trucks there with same issue, put a PCM in ours, said it was good.... well we went to pick it up and it showed the battery saver message again.
(I work for a Cummins Authorized facility) pulled up on the Cummins system documentation showing a 12Volt 6.7L ISB should have at least 1800CCA's and provided this to dealer. (truck has dual 760 CCA) Dealer said they may try this but will need special permissions to warranty this.
I have googled up and down and not seen much about this. Given that this truck's life is pulling a 6000 lbs trailer with a 13000 to 18000 lbs street sweeper on it, I need to know its fixed and fixed right. I am willing to try any ideas ya'll may have.
other things to note:
outside temperature does not seem to matter.
voltage at start will hover around 12V for about 30 seconds then jump up to 14. (my 2011 and the other 2018 at work does the same thing)
You can watch the grid heater cycle via the voltage gauge. even after grid heater has cycled, the battery saver mode is still on.
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Originally Posted by Crshanta
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