if you only have 2 wires it must be an older unit
like in the diagram provided in this post, I have 6 wires on both of the openers in our garage
be careful...I know a guy that rewired his garage doors and every time he pushed the button to open the door his garbage disposal started up....poor guy had to leave the water running every time he went out to avoid burning out the garbage disposal unit...he had a huge water bill until he realized his wife could unplug the garbage disposal unit if she got down on her hands and knees and reached under the sink. They divorced less than a year after that and when he moved away I lost touch with him, so I never did hear whether he fixed the wiring problem or not
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