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Two dead batteries

Oh, geez, the MOSFET spiel again.

Pardon me, but I believe you're the victim of marketing on this subject. At the current levels required, I haven't seen anything but a MOSFET as the bypass transistor in a reg/rec assembly in looooong time.

Inadequate cooling, inductive kickback, or simply poor connections kill a lot more reg/recs than the materials used.

Yes, some of the OEM units are better or at least less stressed than others, but that has nothing to do with the pass transistor used.
 
That's what I figured at first too. Since the same amount of power has to be dissipated, wouldn't that require the same amount of heat generated? If we don't change the location of the RR or anything else, shouldn't that mean the newer RR would generate the exact same amount of heat?
 
DannoXYZ said:
That's what I figured at first too. Since the same amount of power has to be dissipated, wouldn't that require the same amount of heat generated? If we don't change the location of the RR or anything else, shouldn't that mean the newer RR would generate the exact same amount of heat?
Click to expand...

Heat's a function of efficiency, but any power transistor selected for this application is going to have similar characteristics.

Now, you could ask too much of it, if, say, the load impedance is that mismatched to the source. (Say, a corroded connection, loose ground wire, etc. -- enough load might do it as well, since MOSFETs as tough as they are stop being entirely linear and can cycle a bit under high load) And you can ask too much of it if it's not heatsunk well enough or seeing enough airflow.

Or if there's enough of a mismatch between the phases of the stator (bad stator.)

FWIW, age of the reg/rec doesn't mean much...I've got a 20 year old bike working just fine on an OEM RR.
 
It turned out to be a bad rr. A cooked pin and a partially damaged connector were the evidence.

I guess every bike has its week points; one would think that 12k is a little soon to be developing problems like this.
 
nebulous said:
It turned out to be a bad rr. A cooked pin and a partially damaged connector were the evidence.
Click to expand...

Good step in the right troubleshooting direction spotting the cooked/melted connector.

Just to be certain you've covered all your bases, have you run the stator AC output test? What were your stator voltage numbers?
 
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.40 ohms across all three leads. A-B, B-C, A-C.

There was one complication, my dvm reads .12 ohms when the leads are touched. So, it is unclear rather the measurement was .40 or .28. The output voltage was good however.
 
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