It is a Denso brand alternator, Deere part RE72917, 60A.
I had the chance to pull it off and swing by the repair shop yesterday, he tested it and determined it to be fine, charging properly, and providing voltage at the IG terminal. He said he did not know what the L terminal would be for, nor did he test it there.
I removed the cover before re-installing and blew out all the debris. The VR did not show any external signs of damage and the brushes looked to be in fine shape without disassembly.
When I re-installed the alternator, it initially tested to have battery voltage at the L terminal at idle, but the meter did not advance while I sprayed in the vineyard after that.
TxJim- I am confused, because the Deere Tech manual has no reference to the engine speed sensor in the section for troubleshooting the hour meter nor is it shown on the system description of the hour meter wiring diagram. With 23 test points in the procedure, from battery through alternator and relay to the meter and every harness connection in between, it seems pretty thorough.
I have replaced the engine speed sensor and the tachometer works fine, as far as I can tell.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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