Shingenden regulator numbers?

Been looking for a replacement voltage regulator for my '82 KZ750H. The book calls for a Shindengen SH530-12, but I haven't found one yet. I have found a few that look exactly the same, but one has the number SH230-12, and another one has SH430-12. So my obvious question is, what's the difference in these numbers? I assume there must be some difference, or they would all be numbered the same.

I had one of the SH230-12's on there recently, but it died pretty quick. Maybe the different numbers are for different amp outputs from the stator?

For consideration ---

Combo reg-rec from Z1E

Good Fortune!

Thanks Patton, but does anyone know the answer here?

I've found the manufacture numbers stamped on the units are similar, but almost never the same as the listed part numbers. Presumably due to minor changes made over several manufacturing runs.

If it looks the same (same wires, same plugs, physical dimensions, etc), it's almost always swappable.

From what I understand, the 230 will withstand a peak of 19 Amps at 12 V. If your charging system charges at about 14v it will withstand only about 16.5Amps peak. The 430 should be a 35 amp and the 530 a 45 Amp unit @12V.

Why would the voltage affect the amperage rating?

In the rectifier, the voltage drop is around 1v or less because it is determined by the diode's I-V curve. When the diodes see full battery voltage, the curent is zero because the diode is reverse biased at that point. So the current rating is the same regardless of battery voltage.

Likewise for the shunting SCRs. They determine the foward bias voltage while shunting based on forward current. It's usually around 2 volts or so for some typical SCRs. The SCR's only see higher voltage when they are not conducting.

Since the main fuse is proabbly 20 amps, I think any of those reg/recs should handle that, but if the higher numbers handle more current, they are more desirable. Usually, unless something gets miswired etc, I don't think current limit is the problem. As I said, from what I've seen, normal failure seems to be in the detection circuit, but from age, not power handling etc. though heat is always factor too.