Two different issues.
1) Voltage regulator failure feeding full voltage to the field winding making the alternator put out as much as it possibly can, probably 90 or more volts if not prevented by battery load.

2) Shorting of one or more of the rectifier diodes in the alternator which might result it in putting out an AC voltage, but more likely result in no output.

Finn

Tim Andres wrote:

I could be wrong but I don’t believe the rectifiers are going to be found anywhere but in the alternator. Moving to an external regulator will not affect their environment.

Tim Andres

 

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From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Jim Sower
Sent: Saturday, September 10, 2005 5:49 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Overvoltage control (help Ed A)

 

Finn Lassen wrote:

I suspect that the regulators in our alternators are very reliable, providing they are adequately cooled. That would be one advantage for having a external regulator: it can be mounted in a cooler location.