03 6.0L Battery light Alternator Issues - Ford Powerstroke Diesel Forum
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post #1 of 23 Old 04-25-2014, 04:34 PM Thread Starter
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03 6.0L Battery light Alternator Issues

Hello,

I know this has been discussed before but looking to see what people have found as solutions. I am on a trip driving about 1000 miles and 200 miles in I noticed the battery light was on the dash so I pulled off to an auto parts store and bought a re manufactured alternator which I know I shouldn't have but I was desperate. I installed it and it does not work and I am having the same problem with the batteries discharging. I'm hoping I bought a bad alternator but is there anything else I should be checking?

I disconnected the power leads on both batteries to see if the alternator was doing anything and the truck just shut down so I figured that has to be the issue. I am going to the ford stealership tomorrow for an OEM one with the hopes of fixing this but any additional input here would really help!

Thanks everyone!
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post #2 of 23 Old 04-27-2014, 01:19 PM Thread Starter
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Replaced the alternator with a factory one and am still getting the battery light. Both batteries were checked to be good at the auto parts store and I just drove over 200 miles with the battery light on and everything continued working and nothing seemed to die out. Any ideas what this could be?
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post #3 of 23 Old 04-27-2014, 01:36 PM
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check cable connections.

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post #4 of 23 Old 04-27-2014, 02:08 PM
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need to check output with something like a DVM

u can't go oldschool and unhook both batteries on the newer vehicles without risking severe damage

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post #5 of 23 Old 04-27-2014, 02:14 PM
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Quote:
Originally Posted by ZMANN View Post
need to check output with something like a DVM

u can't go oldschool and unhook both batteries on the newer vehicles without risking severe damage

It will cause immediate damage to the diodes in the alt.


And OP, as others have stated. It is imperative you check output voltage on the alternator while it's running, if you turn it off be sure to bring the revs up a bit then back to idle before making conclusions, some alternators have finicky exciter circuits and need a 1200+\- rev to kick it. Lastly, typically ANY big chain auto parts house will test your alt free....in or out of the truck, and when testing make sure to have headlights on and blower on high.


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post #6 of 23 Old 04-27-2014, 03:12 PM Thread Starter
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I have just cleaned all the terminals and am still getting the same result. With the truck at idle it seems the alternator is kicking in intermittently. Battery light on and the engine sounds like it is under no load and battery light off seems like it is under a load or the engine sound changes. What is the best way to check output voltage? I have a voltmeter and I am assuming one side to the alternator lead and the other to the battery?
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post #7 of 23 Old 04-27-2014, 03:13 PM Thread Starter
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I also tried to have o Reilly's check the alternator while it was in the truck but they insisted I had to take it but I'm pretty sure the guy just didn't want to do it. I'll try a different place.
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post #8 of 23 Old 04-27-2014, 03:55 PM
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Auto zone does it in truck.
An with your vol meter turn it to 20vdc and put red lead on + of batt and black lead on - of batt. If you have more issues call me
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post #9 of 23 Old 04-27-2014, 04:32 PM
Ordnance on coordinates

 
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check your serp. belt tension. if its too loose you may not be getting full pull on the alt. pulley.

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post #10 of 23 Old 04-27-2014, 07:33 PM Thread Starter
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Went to autozone, drove the whole way there with battery light on and as soon as I pull in the parking lot the light turns off. I kept the truck running and we checked the alternator output and everything was normal at 13.5v. As soon as I pulled out battery light was flickering on and off. Almost seems like a loose wire if bad connection but could the alternator be pulsing on putting out power? Is there some type of voltage regulator that is big on the alternator ?
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