A 1N5404 is nothing more or less than a common ordinary 3A rated silicon rectifier diode, 400V PIV.
If you guys are talking about the excitation lead for GM alternators this should work fine.
Really all you need to know about diodes is the PIV which for 12 (14) V systems needs to be no larger than about the lowest you can buy commonly, say 50V. You need to know the rated amaperage --in this case 3A---and how much you are trying to draw through it, and---
whether the VOLTAGE DROP through the diode will affect the circuit you are using, which is nominally about .7V but this can change with heavy current draw.
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Today's Featured Article - Memories of an IH Super A When I was ? up to 10, I worked on my Papaw's farm in Greeneville, TN every summer. As I grew older (7), it was the thrill of my day to ride or drive on the tractor. My Papaw had a 1954 IH Super A that he bought to replace a Cub. My Papaw raised "baccer" (tobacco) and corn with the Super A, but the fondest memory was of the sawmill. He owned a small sawmill for sawing "baccer" sticks. The Super A was the powerplant. When I was old enough (7 or 8), I would get up early and be dressed to
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