When I got all my parts together for my dual alternator setup, I noticed something different about the lly setup. First, the pin that goes into the ecm is different than the lb7.(it is the same pin as the one Coyotekid is selling for the high idle kit for the lly). Second, the pin for the dual alternator goes into the ECM 57c2 (connector 2, pin 57). On the lly there are 3 connectors on the ECM. It is on the middle connector. Check with Helms Manual and will show the correct connector and pin slot.
thanks
Joe