Got the coil, plan to install tomorrow in the B+ circuit, as well as the ground. I may just run an 8-gauge ground from my ground point at the cross bar to the battery, just for grins.
I use the Onstar phone quite a bit, so even though I could live with the whine, I don't want too.
Also, purchased a new XM factory lead, that goes from the little junction where the main antenna lead comes into the vehicle and the two signals (one for Onstar, the other for XM) spits off. I was able to adapt the pioneer pink connector (came on the Pioneer XM antenna) to fit the slightly larger GM Onstar wire. I'll install that tomorrow too, as well as trim the faceplate a bit more. I noticed this morning it is rubbing on the bottom too, as well as the top.
