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Old 02-15-2014, 04:50 PM   #1
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Alternator voltage

Today while driving at highway speed, from time to time, I would hear a beep, then my dash would say high voltage. At the time my voltage readout was 13.9 to 14.0. Later when I was coming into Tallahassee on surface streets, my voltage went way up, as high as 17 volts. At the same time my abs light came on, then my check engine light came on. Later still my house control panel showed an error message, voltage too high. Pulled into Wally World , shut everything down, restarted the engine and everything seems normal. Any ideas what could cause this.

I have a cummins 360, in a 2010 Phaeton, on a Freightliner chassis.

Thanks for any help.
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Old 02-15-2014, 05:42 PM   #2
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Start by checking your alternator. Your regulator could be going bad. IIRC 13.8 is normal.

Also, check your batteries' water level, etc.
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Old 02-15-2014, 06:30 PM   #3
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I would expect to see 13.8v to 14.2v. 17 volts is too high. Sounds like a voltage regulator problem.
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Old 02-15-2014, 06:56 PM   #4
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That's what Freightliner help line thought too. Looks like a DIY project if I can find the part, and a place to work on it for an hour or so..
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Old 02-15-2014, 07:06 PM   #5
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More importantly I Would start by checking all grounds b4 anything first then what the others say is right on the money
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Old 02-15-2014, 09:26 PM   #6
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Quote:
Originally Posted by johnnyreno View Post
More importantly I Would start by checking all grounds b4 anything first then what the others say is right on the money
I am having the same problem. Spartan told to do exactly what you are suggesting first prior to changing the Alt.
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Old 02-15-2014, 09:32 PM   #7
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I had that happen once after driving through a flooded street in central Oregon. Water was about 18" deep and we couldn't stop. After a few minutes everything went back to normal and hasn't repeated in the last 4K miles.
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Old 02-22-2014, 05:43 PM   #8
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Problem was a bad alternator. Tested voltage on alternator, 17.3. Tallahassee Freightliner replaced. On the road again.
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Old 02-22-2014, 06:22 PM   #9
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Problem was a bad alternator. Tested voltage on alternator, 17.3. Tallahassee Freightliner replaced. On the road again.
Good to hear. Thanks for posting solution.
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