XFI voltage reading lower then at alternator??

[1985GN]

hey guys i have noticed that on my xfi while cruising or at idle the computer is seeing anywhere from 11.4-12.1 volts....i chcked the car while idling and the battery and alt were both putting out about 14.3...on a data log i did see the voltage go up to 13.0 but oculd that be because the volt booster is kicking in??? any ideas would be great, thanks

 

[SloGN]

where does your XFI get its power from? if your using the caspers interface thru the stock wiring there is the problem. might want to check all the connections and m ake sure that they are clean and snug fitting together. or you can hotwire the ecm straight from the battery. ]



The older FAST b2b box with the speed-pro harness. It gets it power directly from the battery so it can actually sense the true battery volts.