Posted for "FredE" <fwegli@astound.net>:

 John,
 I purchased my B&C regulator about 1996. In the first few flying hours, I
 had several field CB trip-outs. It appeared that the over voltage circuit in
 the regulator was responding to some transients in my system that were
 otherwise not detectable. Upon conferring with B&C several times, we changed
 out the regulator to a later version and the problem went away and has never
 re-occurred after >500 hours. I understand the modification to the later
 version consisted of replacing a resistor in the "sense" line.
 Unfortunately, I don't remember the old and new revision nos., but the
 change occurred around Oshkosh time in 1998 as I had the problem on the way
 there. Your friend could well have the same problem since the earlier
 regulator circuit was simply too sensitive and caused the CB trips. In the
 case you describe, there could be a component - magneto, alternator, spark
 plug wires etc. which, over time, has developed some transient spikes that
 didn't occur before.
 I think your advice is good, but try checking with B&C re: revisions they
 made around mid 1998 to the over voltage sensing circuit.
 
FredEgli LIV N1228E