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Old 11-03-2012, 07:22 AM
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Voltage issue

Hi guys....my truck has been starting really weak lately and I can't seem to figure out why. I had my batteries and alternator tested. The batteries checked out ok and are only two years old anyway. The alternator didn't pass the test. The auto parts guy said it was the voltage regulator in the alternator. It would start out with 11-12v and then eventually get up to 14. So I bought a new DC Power alternator and I'm still have the same issues. I hooked up auto enginuity to it and the battery volts read 11 with just the key on. After about a minute it will climb up to 14. Anyone have any idea what's causing this? Thanks
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Old 11-03-2012, 07:44 AM
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generally that sounds normal.. the battery will read around 11.3- 12 volts before the glow plugs de-energize.. Then you should see your bat voltage go to 13.6-.14.0v. mine has done that since day one
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Old 11-03-2012, 11:05 AM
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Yeah this definitely isn't normal. It started this a few weeks ago. It's getting cold here in the morning and it sounds like it's trying to start with weak batteries. I checked the FICM voltage too and it's reading 48v even while cranking.
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Old 11-03-2012, 12:35 PM
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Check your cables, most especially to the starter. If all is ok, I say bum starter. Sometimes the starter is hard to notice because you get used to it over a long time. I had that problem once, put a new starter in, and the engine sounded like it was gonna fly out from under the hood. Hehehe.

Sent from my phone that somebody didn't help me get.
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Old 11-03-2012, 02:32 PM
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Thanks Southend. I'll look into that tomorrow
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