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You have rvc/regulated voltage control, that circuitry is in your pcm. I'm not saying the pcm is faulty, at the moment, I don't know? You also have a battery temp sensor in the battery tray housing, that might cause problems?
Check for applicable charging system trouble codes, if you haven't already.
gen sets have to be run at set rpms so that the voltage and cycles are correct for the applications
with the rpms as little as 100 rpms below requirement , the voltage will be down , causing a brown out which burns out electric motors and if the rpms are low the required cycles will also be off which affects electronic equipment
service the gen set and find out why the rpms are not at the set level
have the alternator checked by an electrician
a t idle will be low as the exciter circuit will be producing low volts but it should go up when at operating rpms
45 volts at rpms indicates that the field windings of the alternator are not getting full current to produce the desired out put
I believe you are referring to a 220 VAC generator. If you have the correct 60 Hz check the voltage of each leg to neutral. If one or both are low it is in the generator section. The regulated voltage is just for the peak voltage. It does not affect lower voltages unless of course there is a loose (hot) connection.
You will need to test the charging system. Try this simple test, hook a voltmeter to the battery and check the voltage with the key turned off. Should be 12 volts. Now start the engine and note the volt meter reading at idle, it should go up to about 13.8 - 14.2 volts. Rev the engine up and note what happens. If the voltage is low at low RPM 12V and then goes up with more RPM like you stated it could be the regulator or the alternator. Start by switching out or trying another voltage regulator. If this does not fix the problem you will need to test and repair the alternator. The alternator out put can be tested by bypassing the regulator. This requires special equipment and know how. I hope this gets you
P1338 - Fuel Pump feedback circuit low/high voltage. This is indicating that your fuel pump is either getting too much voltage or too little voltage as is sensed by the fuel pump control module. Now, this can be caused by either bad wiring connections or a battery not charging causing low voltage. Should read 14 1/2 volts if charging at 1500 rpms
Sounds as if your alternator is not charging the battery. The battery is the main source of your engine "spark". the alternator is across the leads to supply charging to bring your battery up to the 13.2 volts that is available. Of course the alternator will run your auto if it is producing voltage, i.e. jump start, or push start. It takes a certain voltage to run your computer which monitors the battery and if that voltage is not sufficent to produce the timed spark, (battery runs down), then the vehicle will not fire on all cylindars.