That is the ELD saving you gas mileage. nothing is wrong, everything is working as-is. the ELD doesn't turn off the alt unless the vehicle is in gear.
Lighting isn't through the ignition, since you can have lighting while the car is turned off. the ELD only monitors the load on the ELD that is ignition based (and fed through the ELD).
Turn your A/C on or defrost on, etc. and the voltage will increase. But this isn't a solution since it robs the alt of current for those devices.
The ELD bypass I developed works great.
http://forum.sounddomain.com/ubbthreads.php?ubb=showflat&Number=1804618&page=1#Post1804618