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Old 10-29-2020, 11:03 AM   #1
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Alternator

I have a 2002 executive. amp gauge shows discharge horn honks changed the alternator still have the same problem
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Old 10-29-2020, 11:24 AM   #2
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Can you expound on your problem a bit? Are you saying the gauge shows discharge when the horn honks or just the horn honks for no reason? Are you showing 13.6+ volts with the new alternator?
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Old 10-29-2020, 11:34 AM   #3
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New alternator is putting out 15 V showing 10 V on amp meter when I rev the motor the horn honks as it did with the old alternator
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Old 10-29-2020, 11:45 AM   #4
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If you have a battery isolator, it may be bad. That can give you strange voltage readings.

The horn ? Or an alarm inside the cab.


Isolator looks like this.Click image for larger version

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Old 10-29-2020, 12:26 PM   #5
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Airhorns they go off at short blast
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Old 10-29-2020, 09:55 PM   #6
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If you are loosing the one chassis diode on the isolator and not some internal connection issue . You should be able to swap battery cables or flip it over if the cables wont reach. To at least test the alt. to chassis diode on isolator.
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