The AGCO parts book shows Delco internal regulated alternators are OE for all applications of the 245 in your serial number range. So you are not doing any kind of a conversion. The number one terminal being connected to the oil pressure switch drops the connection to the alternator when the engine is not running so no diode is needed to negate an engine off draw. The other purpose for the diode does not apply on a diesel, on a spark ignition engine it is used to stop feed back from powering the coil when the engine ignition is shut down not allowing the engine to stop. But that only applies when powering the number one excite terminal with the ignition circuit. On a gas engine if you choose to energize the excite circuit through an oil pressure sender the diode is not required in that configuration either.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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