FOURTRAK REV COUNTER FEED

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The Rev Counter has not worked on my Fourtrak since I bought it. Iv just took the alternator off and had it rebuilt as it was on the week side, while taking it off a single wire with a black plug 'dropped' down from the area under the turbo this wire goes into the loom that connects to the alternator and seems a likely candidate as the feed for the Rev Counter.
My problem is that I cant find the other end! Please can anyone advise where the other end is likely to be? I have a feeling it was not connected before and the fact it dropped down from below the turbo may be a red herring. Iv looked from below and everywhere else i can thing of to no avail.
Please help!