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  #1  
Old 11-04-2014, 08:39 PM
dhamblet dhamblet is offline
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Default Ram 3500 Alternator problems

2006 Ram 3500 CTD. Original battery is getting old. WHile working on the truck I guess it got run down. ANyway I hooked a charger up to it and charged it. Then I noticed the sticker on the fender which says not to apply more than 12V to the system while charging or starting or you may damage the starting system or engine. Now the check engine light is on and the ammeter reads about 12v so I suspect I have fried something in the alternator. Does this ll make sense? Can't use a battery charger without disconnecting the battery????

ALso I am about due for a new battery since the original one appears to be leaking acid around the neg terminal. O'Reillys wants $170 for a 575CCA battery with a 3 Year Warranty. Seemed a bit much for such a short warranty. Other suggestions???
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Old 11-04-2014, 09:59 PM
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First off, you should be talking batteries. Don't you have two? If you don't your suppose to.

Second, 12 volts is a nominal number. I good battery should have 13 to 13.5 volts. My charging system reads more like 14 volts when the truck is running.

If you do have two batteries its also common for the cable that connects them to get bad. What you see as corrosion around the terminal may just be a normal furry look. This can be cleaned. If you have the original batteries, it may be time for new ones. Mine lasted about 10 years.
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Old 11-05-2014, 02:04 AM
dhamblet dhamblet is offline
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yes I have two batteries. The issue I was asking for input on is the sticker on the drivers side fender which clearly says not to apply over 12 volts while charging or jump starting the vehicle. And I did, realizing the alternator puts out 14v while charging. And now the alternator is dead, but that may be the result of something else. I'm looking at replacing both batteries $140 each + $10 to install each one at Les Schuab.
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Old 11-05-2014, 09:21 AM
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Hi dhamblet,

Some bigger diesels have 24 volts systems and some chargers are designed to handle those systems. They are telling you NOT to hook up one of those. And not to put two batteries in series as that also would create a 24 volt battery.

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Old 11-09-2014, 12:42 AM
Lazarus Truck Lazarus Truck is offline
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Good advice Preachp. There really isn't much to an alternator anyway. If it doesn't smell burnt, it is most likely a rectifier. Look into an alternator re-build kit before spending a gazillion dollars on what might just be a rectifier or voltage regulator.
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