Re: Calling all instrument/charging wizards

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Posted by #1 Son ( on 20:55:10 08/29/07

In Reply to: Calling all instrument/charging wizards posted by Turbine

Voltage reads high while engine is running. Near Red Line 19V. Voltage at lighter while running reads normal 14 to 15 volts. At this point suspect instrument problem.

The first thing you need to do is to borrow a digital voltmeter to do a voltage check to see if what your truck's meter is reading correctly. Auto Zone may even lend you one.

1) Do a voltage check with the engine OFF. The voltage should read nominally at about 12V if the engine had been off overnight. It would read about 13-13.8 volts, or so right after shut off. The truck's meter reading at engine off is meaningless.

2) Do a voltage check while the engine is running. It should read 14.4 to 14.8 volts right after engine start. Check these readings against the truck meter's reading. If it still reads 19V as you had said, then, the truck's meter reads high!

3) The reading will gradually go down to about 13.8V when the alternator shouts off. Again, check this against the truck meter's reading. If it reads 14-15Volts, the truck's meter read high!

On the other hand, if the digital meter reads High as what the truck's meter reads, I suggest that you have the truck's charging system checked by a pro if you don't know what to do!

#1 Son


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