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The voltage on the vehicle is regulated by the "Voltage Regulator" inside the alternator. There is no need to change the complete alternator, just the regulator.
A little more info would help.
Throttle position sensor?
How do you know they are reading max voltage?
Are you trying to replace the voltage regulator?
The voltage regulator it in the ECM.What you need to do is go to the basic which can be overlooked like is the Alternator fuse burnt open that will require a new fuse, how is the battery terminal connection? You need to check that,Or how is the calbe from the alternator to the Battery is the connection in good shape? Those you need to check you mainly need a voltmeter to do this but a good visual inspection can get results,
The Electronic Voltage Regulator (EVR) is not a separate component. It is actually a voltage regulating circuit located within the Power train Control Module (PCM). The EVR is not serviced separately. If replacement is necessary, the PCM must be replaced. Hope this helped and best wishes.
Put a volt meter on the battery itself and take a reading when it is doing that. If charge rate is over 14v the alternator may be working but the output is not being cut down to "useful voltage" You may have a regulator problem.
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