Posted by Bob on December 30, 2017 at 12:06:41 from (64.255.159.199):
In Reply to: F350 Starting Problems posted by UP Oliver on December 29, 2017 at 22:16:01:
NOT sure what year they went to the new system, or if yours has it, but some time before 2009 the powertrain management 'puter took over the control of the alternator.
'Puter talks over CANBUS to the VR in the alternator and tweaks the alternator voltage output based on lots of things, likely including engine load, and emissions.
So the voltage "set point" at any given time is what some algorithm in the 'puter thinks it should be, rather than what you actually NEED to make things work!
Thought is was ridiculous quite a number of years ago when mopar put the VR in the engine computer, but by now Ford, and I suppose every other mfg. has done it!
NOT sure what goes on when you put an aftermarket high-output alternator on one of those vehicles, does the 'puter throw a code when it can no longer boss the alternator around?
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