I've seen SI series (10SI, 12SI and 18SI) draw up to 2 amps @ 12 volts on the field/excite circuit. So in reality - a single 3 amp diode is fine. Two in parallel just gives extra insurance. So does using a 5 amp or 10 amp diode. You can't use one that rated for too much amps. But if you use one for too little - it will blow like a fuse.
Many automotive circuits use a resistor instead of a diode. It can be done either way - or with neither and a switch used instead. Momentary, pressure sensing, etc. The problem with a resistor is - if not matched correctly -enough current can pass and prevent engine shut-down. This is especially true with diesels with electric shut-offs. Unlike a resistor that just lowers voltage (resists current and does not stop it) - a diode is an electrical one-way check-valve.
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Today's Featured Article - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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