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post #1 of 13 Old 04-22-2013, 06:15 AM Thread Starter
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alternator problems

i've got a 2005 F250 with the 6.0L motor and i can't keep the batteries charged. I had my alternator checked and it's putting out 13.5v. what should it be putting out? My motor only has one alternator. Also what volt alternator should i put back in? My truck is stock and i don't plan to be putting on many lights or anything else that should drain the batteries.
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post #2 of 13 Old 04-22-2013, 06:46 AM
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Well, there isn't much to the charging system...

You have the 2 batteries, the alternator, and the voltage regulator which is incased in the alternator.

How old are the batteries and are they the same? Batteries on the 6.0 should only be replaced as pairs.

I would disconnect the batteries and charge each one to see if they will hold a charge.

If they both hold a charge, then replace the alternator.

Don't take them to one of those auto part stores for testing, they never test properly...the alternator either.

If you do replace the alternator, make sure you only get a Motorcraft replacement because all others are junk and have a high failure rate right out of the box. (ask me how I know...)

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post #3 of 13 Old 04-22-2013, 07:16 AM
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If the alternator passed a bench test and you believe it's good, have your batteries load tested. As mentioned, you should replace both batteries even if one of the batteries is bad. IMO, the factory alternator is far from sufficient. It can't even keep up with the glow plugs when the engine is running. I upgraded to a DC Power alternator and would definitely recommend them, but would agree that you shouldn't consider an alternator from NAPA, Auto Zone, etc....

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post #4 of 13 Old 04-22-2013, 10:14 AM Thread Starter
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i guess the batteries are around 2 years both were replaced at the same time. I did have the batteries and alternator tested at auto zone. where should i go to get something like that checked? they said the batteries showed good but needed charged.
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post #5 of 13 Old 04-22-2013, 10:15 AM Thread Starter
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Quote:
Originally Posted by Snake View Post
If the alternator passed a bench test and you believe it's good, have your batteries load tested. As mentioned, you should replace both batteries even if one of the batteries is bad. IMO, the factory alternator is far from sufficient. It can't even keep up with the glow plugs when the engine is running. I upgraded to a DC Power alternator and would definitely recommend them, but would agree that you shouldn't consider an alternator from NAPA, Auto Zone, etc....
what does it take to go to a DC alternator?
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post #6 of 13 Old 04-22-2013, 10:19 AM Thread Starter
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what about getting the current one rebuilt?
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post #7 of 13 Old 04-22-2013, 11:17 AM
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Quote:
Originally Posted by kacole View Post
what does it take to go to a DC alternator?
All it takes is $$$

Check out DC Powers web site.


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post #8 of 13 Old 04-22-2013, 11:19 AM
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Quote:
Originally Posted by kacole View Post
what about getting the current one rebuilt?
The stock one is barely able to do the job at all when everything is in tip top shape so why waste the time to stay the same. Voltage issues are one of THE main reason FICM fails.


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post #9 of 13 Old 04-22-2013, 12:55 PM Thread Starter
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here is one is seen at DC Power is this what i need it is 185 amps to get more than that the price seems to double. will this do what i need? if i decide to put some off road lights will it be able to keep up? does this one require a shim or will it just bolt up? https://www.dcpowerinc.com/high-outp...rstroke+Diesel
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post #10 of 13 Old 04-22-2013, 02:07 PM
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As long as don't slap on six 9 inch halogen off-road lights like I have you should be good, but I highly recommend that you upgrade the positive AND negative cables, plus clean both grounds down to bare metal and use a conductive grease on them. I gained half a volt just by doing my cables. My DC Power SPX fit perfectly and came with an adaptor cable for the PCM connection.


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