If the battery is good and the genny and Voltage Regulator, Id expect it to charge at the 15 to 20 amp range right after start up, but then if lights aren't on Id expect it to drop to 3 to less then 10 maps subject to RPM and loads.
If you put a voltmeter on the battery Id expect a good battery to read 12.6 volts sitting but at fast RPM with a good genny and VR maybe rise to at least to 13 up to around 14 or so subject to RPM and battery and charging system.
If it stays at a constant 15 amps ALL THE TIME theres a possibility the battery may overcharge and outgas excessively which can damage the battery. It sounds like the VR may be bad or mis adjusted which can be fixable, but thats a bit hard to describe over the net absent the actual genny and VR and all their specs and data.
Id start with a voltmeter on the battery and if voltage doesnt (after a long time at fast RPM) rise to much over 13 to 14 I wouldn't worry that much but if it goes to 14+ to near 15 and stays there constantly, Id bet its outgassing and will overcharge and eventually ruin the battery.
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