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alternator gets really hot


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jsti4
Novice

May 9, 2012, 8:16 PM

Post #1 of 11 (15192 views)
alternator gets really hot Sign In

i have 2004 F350 6 liter powerstroke the alt gets hot and stops charging both batts and alternator are new i need some help please !!!!it shows its charging at 13.3 at the batteries and 13.6 at the alternator


Discretesignals
Ultimate Carjunky / Moderator
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May 10, 2012, 4:56 AM

Post #2 of 11 (15120 views)
Re: alternator gets really hot Sign In

Is this vehicle used for snowplowing or does it have any aftermarket accessories that use a lot of current?





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jsti4
Novice

May 10, 2012, 7:04 AM

Post #3 of 11 (15107 views)
Re: alternator gets really hot Sign In

I do not have a snowplow or any aftermarket acc. on my truck it just started getting hot and shutting of so i replaced the alternator cleaned all connection and checked all plugs on the engine that i could find but after minutes of running the alt gets very very hot and shuts off.


nickwarner
Veteran / Moderator
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May 10, 2012, 5:54 PM

Post #4 of 11 (15089 views)
Re: alternator gets really hot Sign In

Have you checked the cable from the alternator to ensure it isn't shorting out somewhere? Thats a tight engine bay in there and things do rub.


Discretesignals
Ultimate Carjunky / Moderator
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May 10, 2012, 6:54 PM

Post #5 of 11 (15085 views)
Re: alternator gets really hot Sign In

Wonder if you could get your hands on an amp clamp and see how much current it is putting out.





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jsti4
Novice

May 10, 2012, 9:25 PM

Post #6 of 11 (15071 views)
Re: alternator gets really hot Sign In

thanks but i did follow the cables from alt to batteries no signs of broken wires or shorts all wires test good


jsti4
Novice

May 10, 2012, 9:30 PM

Post #7 of 11 (15068 views)
Re: alternator gets really hot Sign In

does anyone know if the fuel injection control module and the alternator have anything to do with each other ?


Discretesignals
Ultimate Carjunky / Moderator
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May 10, 2012, 9:42 PM

Post #8 of 11 (15063 views)
Re: alternator gets really hot Sign In


Quote
it shows its charging at 13.3 at the batteries and 13.6 at the alternator


Is that the voltage your getting when you think it it isn't charging?

The FICM has nothing to do with controlling the output of the alternator. The alternator has an internal regulator and sensing circuit that is used to control the field. The electromagnetic strength of the field determines how much the alternator puts out.

You need to make some power and ground voltage drop measurements at the alternator stator and regulator circuits to see if anything goes missing or wacky when it quits charging. It also would be nice to see how many amps the alternator is putting out. If the alternator is putting out max amps, it won't last long.

Another possibility is you could have an inferior alternator. Some of the aftermarket remans are junk.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on May 10, 2012, 9:46 PM)


Tom Greenleaf
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May 11, 2012, 6:17 AM

Post #9 of 11 (15051 views)
Re: alternator gets really hot Sign In

2004 - you should be on your third battery!

Tom


jsti4
Novice

May 11, 2012, 5:29 PM

Post #10 of 11 (15029 views)
Re: alternator gets really hot Sign In

found something on another forum about my abs system i removed the fuse for the abs system and everything works great now charging system is good alt doesnt get hot every thing seems to be good i will have the abs system checked out but atleast i can use the truck for now . Thanks for everyones help and your time on my problem i will be sure to return the favor when i can !!!!!!!


Discretesignals
Ultimate Carjunky / Moderator
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May 11, 2012, 6:19 PM

Post #11 of 11 (15027 views)
Re: alternator gets really hot Sign In

That's interesting. Which fuse did you pull? Was it the 60 amp? If so, something in the ABS system is using a lot of current and overworking the alternator.

Has the ABS light been on before removing the fuse?

We'll keep this thread open, so let us know what they find out about the ABS system.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.






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