Posted by Hobo,NC on December 30, 2017 at 06:00:04 from (75.136.231.157):
In Reply to: F350 Starting Problems posted by UP Oliver on December 29, 2017 at 22:16:01:
You need to find a mechanic that has a load tester that is capable of at least 500 amps and knows how to use it. Each battery will need to be checked separately and start the test at a full charge.
He would also need a clamp on high amp probe to check alternator amp output and know how to use it. He will use his load tester to apply a load and confirm the alt is capable of at least 10% of its rated output. On your truck he may not need to load it after a few starts and all the loads that are already there the alt will already have its plate full... It would be interesting to know what normal plow motor amp draw is.
He will also need a DSO to check alternator current wave form and knows how to use it.
In between all this is the belt drive system...
That's the LAW!
Those alternators live a ruff life It almost needs two I would not dream of putting a low end battery in a truck like yours it would be the biggest and the best money could buy. My 7.3 glow plugs draw 160 amps cold they are on for at least 30 sec. the amp draw does tapper down to 60/80 amps. The alt starts off every time under the gun they are not know to be long winded I replaced mine at 124K the slip rings were worn slap arse out.
Confirm battery health and alternator condition its the law...
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