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Once again, my poor memory will probably fail us... :lol: but I think that this bulb is a little different, the socket it sits in has a couple of metal contact plates and the metal casing at the bottom of the bulb has guides that slide onto the contact plates (made that sound REAAAALLLY confusing... haha, it isn't though), once you get down there and take the bulb out and unclip the wire harness you should be able to see what i'm talking about, i'm fairly confident there are three wires that lead to three contact plates, a ground, a constant, and a signal, and I'm not as confident but still think the constant signal is from the purple wire... (don't know why but purple wire just screams inside my head when I think about this, lol)
If I can remember correctly (I basically just spent like 20-30 minutes fussing around with electrical tape and the contacts, lol) there are three contacts, a ground, a continuous, and a flash. Obviously you are looking for the continuous signal to black out. I "THINK" it is the contact that the purple wire leads to, but you can quickly find out by trial and error, there are only three options. Also, I remember trying to put the electrical tape over the contact and then pushing the light in, or vice versa, and it did not work (i kept trying for a few minutes... ) but when i switched the method it went is much smoother and it was done, once again, going to be a trial and error sort of gig.
That is just the way I did it, BUT (actually now to think of it I may have gone this route... I'm pretty sure I was DIY'ing while under the influence ) you can also tackle it from other places if I remember correctly... like at the wires or where, WAIT, I think I did this... where the harness plugs into the socket... god I'm so confused on what I actually did now... just go with what is on top. haha