Posted by Steve@Advance on December 30, 2017 at 06:24:49 from (66.169.147.211):
In Reply to: F350 Starting Problems posted by UP Oliver on December 29, 2017 at 22:16:01:
Alternators can have reduced output. Caused by a failed diode, bad connection, or slipping belt.
It will need all the power it can get under the conditions you describe. One of our company trucks is an 04 F350. I have noticed the glow plugs continue to cycle in cool weather even after the engine has been running. I would think they would continue even longer in the extreme cold you describe. When they are on, the voltage drops considerably, one would think the alternator is failing as it seems to just about balance the load at idle. But it's been that way since new, and never discharges the battery, so I assume it is normal.
But add the plow pump, no doubt the alternator will be struggling to keep up. I'm sure that is why there was the "dual alternator" option.
With the alternator being maxed out, that will stress the alternator, along with the rest of the delivery system, as in the wiring, belt, pulley, etc. I would check all these components. Look for any heat discolored wiring, check the belt tensioner, those have a history of failure. Feel the alternator pulley, if is hot, the belt is slipping.
IIRC, that alternator is mounted on top, easily removed. If so, take it to an alternator repair shop, have it tested. There may also be a higher output alternator available.
One last thought, is this truck used regularly? If not, a battery tender will get it off to a good start with a full charge.
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