Accessory is controlled through the ECU on the Hummers, with the LOC you can connect the two ground and the two positives to the same speaker to steal the signal for the amp, and yes you can tape of the ground wires that are on the LOC.

 

Yea, for the radio it is. but you can get the 12v switched signal under the steering column since all they need is the switched 12v for the remote lead, no?

 

should be able to, the fuse panel should have a few slots that you can tap into and get a signal from since there is hardly any amp draw for the remote.