Ok - the problem... At Reno this year, I ran around the pylons at 3000 rpm for racing. During the flight on Saturday, a 5 amp CB popped. Since then, at higher rpm (2500 and up) it will pop in about 10 to 15 seconds. This, I take it, is the alternator field cb. The battery does not charge when this cb is popped.

Is this an alternator, voltage regulator, CB, or other issue? I didn't build the airplane, and there is no detailed wiring schematic.

Scotty,

 

Hmmmmm, sounds like it's time to trace out the wires to unlabeled breakers and identify them.  How about a call to the builder? 

 

Do you suspect a short when there is hi rpm induced vibration?  Since the field voltage is managed by the regulator, that makes it suspect.  Is there more than one wire coming off the breaker?  If you trace the wire(s), is there contact with metal grounded parts or possible chafing thru to another wire in the bundle?

 

With the breaker pulled, you could trace the wire(s) with an ohm meter from the breaker to where ever.