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DR350 tach problem

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My 99 DR350se's stock tach quite working the other day while I was tearing down a dirt road. I've inspected the wiring behind the headlight fairing and can't find any splits or loose connections. Any suggestions on where to start investigating next and will a simple wire tester be able to tell me if those wires are getting a signal?

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Three wires for the tach:

Orange wire is + 12 volts

Black with white stripe is ground

White with red stripe is the tach signal line from the CDI box. No one knows if it is a variable dc voltage or AC pulses on this line. I have never measured it myself.

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mine quit once when the ground wire separated INSIDE the wiring harness. That was hard to find!

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