I have a 96 FLTCUI that i just bought 2 weeks ago and the volt gauge has always read low 10 @ idle and 12-12.5 while cruising. Well today the volts dropped and fluctuated to 8 - 10 while idling and brakes and turn signal on and would only go to 12 when cruising. I have downloaded the manual and schematics but they are crap.
Idling it produces 13.6 and 14.2 @ 1500 at the battery. I have checked the voltage @ the gauge in the fairing and it is definitely low 10 @ idle and 12 @ 1500. Which means I have apx 2 volt drop in the system from the battery to the ignition switch I guess.
Does anyone have any quick thoughts before I pull the fairing and instrument panel to get a better look @ the switch harness.
It isn't affecting the injection any @ idle...runs fine. I did notice an extra relay fed directly from the battery inside the fairing that is bypassing another relay...not sure but my thought is it is for the ecm power relay. **** pore wiring diagrams don't have color schematics for the wires. This would explain why the injection doesn't shut down due to low voltage.

At least that is my thought on it. BTW I am an auto technician so I do understand electrical. Just looking for any quick hints. Thanks, Bill

 

As an auto technician you know that somewhere between the batt and the wire at the gauge there is some resistance. Check all your conections and ground wires. Voltage drop from the batt to the gauge should not be 2 volts.