charging question - Ford Powerstroke Diesel Forum
 
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post #1 of 4 Old 08-25-2013, 02:13 PM Thread Starter
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charging question

I had a problem starting my truck a few days ago. It started right up after sitting for a few days. Then I drove it 1 mile up the road to get some milk. I got back in the truck and it did the click thing the first time I tried to turn it over. The second time I nursed to start. It was a slow start. I narrowed it down to a loose negative battery terminal. I cleaned and tightened it up and checked everything with my multimeter. Sitting it holds 12.65 volts. After the glowplugs go it gets drawn down to 11.6, during starting it goes down to 10.45 volts. At an idle it only makes 11.84 volts. I rev it up and the alternator doesnt' excite till almost 2000rpm. Then only goes up to 13.75 volts. My uncle told me 20 years ago the magic voltage in automobiles is 14.6 and that you need to be as close to that as possible without going over. Are these voltages normal? And does it take that engine speed to excite the alternator?

04 F-350 Single Wheel 4X4
05 Excursion
2000 VW Golf TDI (dead)
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post #2 of 4 Old 08-31-2013, 05:58 AM Thread Starter
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No one has any insight?

04 F-350 Single Wheel 4X4
05 Excursion
2000 VW Golf TDI (dead)
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post #3 of 4 Old 08-31-2013, 02:46 PM
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Sounds like its time to replace the batteries, but load testing can confirm that.
It also sounds as though your alternator is on its way out. I highly recommend an upgrade at this point, like to a DC engineering 185oem. I made the upgrade and you can tell the difference in how the truck runs. It boils down, the oem unit is severely undersized, and the FICM suffers from it.

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post #4 of 4 Old 09-01-2013, 06:11 AM
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typically a 6.0 will sit and idle around 13.7-14.0v after about 30 seconds when the alt kicks on.

-Matt

Ford Senior Master Tech

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