Alternator bad? - Ford Powerstroke Diesel Forum
 
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post #1 of 9 Old 09-13-2013, 10:57 AM Thread Starter
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Alternator bad?

I have a 2000 psd and I noticed on longer hauls for about a year now my battery light would flash a few times. I replaced the alt about year 1/2 ago. So I went on a trip a week ago and when I stopped for fuel the batterys were dead and it wouldnt start. Batterys are good. SO I replaced the alt today with another new one and when I first started it it only read 11.98 volts for about 10 seconds then jumped to 14.38 and stayed there. Is there something else that could be wrong or was it cause I just replaced the alt?
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post #2 of 9 Old 09-13-2013, 11:53 AM
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Those voltages are normal. When you first start the truck, the glow plugs will come on regardless of temperature and bring your voltage down. Once they shut off your voltage goes up and 14.38v is perfect.

I would check the 2 wire plug on top of the alternator. It may have a bad connection that is causing the alternator to turn off and the battery light to come on. I would also rig up a in cab voltage gauge so you can see if your voltage is dropping while driving, the stock one is nearly useless. Did you check the voltage when the truck wouldn't start? That would give you an indication if the alternator is bad, you have a huge draw like a glow plug relay stuck on or a bad cable.

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post #3 of 9 Old 09-13-2013, 04:21 PM Thread Starter
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Ok the makes sense. Is there anywhere in the cab I can hook a ohm meter up momentarily?
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post #4 of 9 Old 09-13-2013, 05:12 PM
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You could use the power port but you should set your meter to dc volt. OHM is to measure resistance.

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post #5 of 9 Old 09-13-2013, 05:44 PM Thread Starter
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Yea I just call it an ohm meter
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post #6 of 9 Old 09-14-2013, 09:33 AM
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If you bought it at Auto Zone, or other chain store, better get use to changing them out. Last time I delt with a alt from a chain auto parts store I ended up going through 6 in a year and a half period, not on this truck. They are rebuilt with the cheapest components they can find and they rely on the fact that most people trade vehicles every 2 years or less. If you want a quality alternator or starter buy it from DB Electric. They are all I recommend any more.

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post #7 of 9 Old 09-14-2013, 12:23 PM Thread Starter
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Funny you say that as I got a remanufactured one from advance auto that failed. The new one is from db electric
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post #8 of 9 Old 09-15-2013, 09:12 AM
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Quote:
Originally Posted by panteramatt View Post
Funny you say that as I got a remanufactured one from advance auto that failed. The new one is from db electric
Quite possibly the last one you will ever put in your truck. I want to try one of their high torque starters the next time I need one.

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post #9 of 9 Old 09-15-2013, 10:51 AM
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Either that one or DC Power Engineering.

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