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LinkBack | Thread Tools | Display Modes |
11-10-2009, 08:52 AM
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Another Alternator bad??? truck seems like batteries going again... Help
Since the spring I am on my third alternator. First one went bad and I had it replaced under warr. The second one they gave me went bad after two months or so. Now it has been 3-4 months and yesterday I went to start the truck and it started hard (like batteries are dying). I didn't put a meter to it yet but... had a couple of thoughts, what do you think?
1 - another bad alternator (not likely to get two in a row) 2 - one of the batteries is dying and it is sucking the life out of both of them and the alternator can't keep up 3 - something wrong with starter? (don't know how to check this to see if it is the problem or not). 4 - something else that I have no clue about, much less how to check. Help please.... 
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11-10-2009, 09:54 AM
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Check your connections... make sure they are nice and tight. Look over your battery wires and make sure they are not corroded and need to be replaced. I have replaced starters before because of bad connections...  I have had one bad battery take out my alternator before. Might be worth your time to have your batteries tested. Make sure you unhook one before they test them...
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11-10-2009, 10:59 AM
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I am buying new batteries on the way home to drop them in. Already looked at connections and they looked fine. Other thoughts?
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11-10-2009, 11:07 AM
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have you monitored the volts once the alternator kicks in.... that is easy to check
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11-10-2009, 11:18 AM
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I just just had a problem like this. My alternator went bad and was overcharging the batteries, literally cooking them. It was charging them to 16.5 volts. I first replaced the batteries thinking they went bad (becuase the guages were haywire). Then the same thing happened. I dont have a tuner yet so I had to go and get it tested just to make sure it was the alternator and sure enough it was...ended up getting one at NAPA and replacing it.
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11-10-2009, 11:38 AM
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There is a TSB out that faults a ground under/around the fan shroud. I went through 3 alternators and 2 sets of batteries before my mechanic found the TSB.
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