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f1206crazy

mx120 tach problem

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I am having a problem with my mx120. tha rpm, mph, and hr meter quit working on the dash. we had the dash checked out and it is fine. is there a sensor that controls this??? any help would be appreciated. jim

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I have heard of the alternator making the dash do weird things. Might check that out

Nate

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Alternator "w" terminal drives the engine rpm tach, make sure wire is hooked to alternator. Make sure you have power and ground to the cluster.

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Cih tech is spot on. The AC or "w" terminal Goes bad. Freaks out tach and pto. The dash tells pto it aint matching rpm and thinks its slipping so shuts it down. Mind numbing frustration. But since the hr mtr is wonky I would check the wiring feom key switch and make sure all connections are good. Also the big grd terminal behind the dash tight?

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