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2+2 electrical question


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#1 Silver Dollar

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Posted 29 March 2012 - 11:12 AM

I have a 3588 digital tachometer that is giving me problems. Original unit w/ rpm, exhaust temp, 1000 pto, & mph. Seems to be speratic, but at times it won't indicate the proper rpm, mph, etc. Sometimes it reads high, sometimes low, or it flutters up and down w/o changing the motor rpm or tractor speed.

I had a replacement tach unit so I switched it out. Same issues, so it looks like its in the wiring harness? Speed sensor under the seat was replaced a couple of years ago. Does anyone have suggestions or steps for trouble shooting this? I'd like to have this working correctly because its my planter tractor.

TIA, SilverDollar

#2 pete 23

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Posted 29 March 2012 - 11:39 AM

Disconnect the engine speed sensor and clean the connector contacts, remove sensor from clutch housing , clean end and then readjust it , turn in until it contacts flywheel ring gear, then back out half to three quarters turn. There is also a inline fuse down by the other fuses, clean those connectors. On the back side of the data center is a pull out module, clean those contacts with a pencil eraser. Check and clean your ground cable on right front cab mount. Then just throw up your hands.

#3 pete 23

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Posted 29 March 2012 - 11:39 AM

Disconnect the engine speed sensor and clean the connector contacts, remove sensor from clutch housing , clean end and then readjust it , turn in until it contacts flywheel ring gear, then back out half to three quarters turn. There is also a inline fuse down by the other fuses, clean those connectors. On the back side of the data center is a pull out module, clean those contacts with a pencil eraser. Check and clean your ground cable on right front cab mount. Then just throw up your hands.



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