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Old 01-13-2017, 09:01 AM   #1
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Question Alternator putting out 18v

Allegro Bus 2010 intermittently began showing 18v on dashboard gauge when the engine is running & 12v when not running. The chassis batteries show 12v when stopped.
I saw somewhere a bad ground connection could cause this problem.
Has anyone else experienced this problem?
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Old 01-13-2017, 09:13 AM   #2
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Typically the voltage will spike when the alt voltage reg can't see the batt voltage. It sounds like a loose/broken wire somewhere. Easy to troubleshoot if you have some method of putting a load (100-200 watts) on the wires going from alt to batts. Start at the alt and work back to batts. Don't forget the ground wires. Measure the voltage at alt as you do the loading. Good Luck. Hope that helps
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Old 01-13-2017, 09:21 AM   #3
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Yep, like he ^ said, check for a good ground with a multimeter. If you have a good ground, then the regulating resistor inside the alternator has died.

You can boil the batteries pretty quick with 18 volts!

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Old 01-13-2017, 09:31 AM   #4
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Another test you maybe should do is check voltage at alt, then at batts when engine is running. If high at alt and low at batts, then open some where.
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Old 01-13-2017, 11:04 AM   #5
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Bad Alt

Had exactly the same problem the Alternator was bad it had integrated regulator and that was bad. Replaced no issues since.

Also it did cook the batteries
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