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Tach works part of the time

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February 15, 2012

Dan Madison

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I am having trouble with my tach. It usually doesn't work until the tractor gets warmed up really good, usually about 30 minutes. I have the cluster gages. I have adjusted the sending unit but no difference. Any Ideas?

February 15, 2012

Little_Grizzly

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How are your other gauges working? Have you measured the voltage coming from your battery?

February 15, 2012

RichWaugh

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At a guess, I'd say you have a bad ground or other connection in the instrument cluster. It takes 30 minutes of heating/vibration to finally make contact like it should. With electronic gauges like the tach, the voltage difference between working and not working can be pretty minute. I'd suggest you go through the wiring from the sender to the tach, section by section, cleaning and tightening everything and, when you get to the instrument cluster, look for corroded or "crystallized" looking solder connections. Any that look suspect can be re-heated with a soldering iron or gun to "freshen them up."

February 15, 2012

Dan Madison

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Other gages work fine. Plenty of voltage from the battery. I suspected a bad ground but haven't found it yet.

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