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Low Voltage Output on Big Inch Modified


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I have a 99 FLHTCUI bored & stroked to 120" by Marcum Racing:. In addition I replaced the factory stereo with a high end alpine during the rebuild. The problem I am having is the volts drop below 8 at idle. This occurs now even when the radio, accessory switch, running lights etc are turned off.

It seems the battery isnt charging, and that there is only about 10volts output even @ 3000 RPMs but I cant tell because of the additional cranking amps the big inch motor draws. Any thoughts?

Should a heavy duty or 3 phase 40amp chargins system be added with the big inch and stereo upgrade?