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I bought one from TeamSpeed and had no trouble hooking it up (follow the instructions provided).
I've been using it for about six months now and so far, no problemos
When I initially hooked everything up and turned the ignition switch over, my 8500 didn't power up. But I remembered reading someplace about power at the mirror being shut off when the doors are open; once I closed my driver side door (which was open), it powered right up