Ok I've got one for the electric wizards,

The facts: 1 "John Reiner" 2K watt generator brush type w/ a Wisconsin
robin engine. picked up used over the summer, worked well put about 10hrs on
it. There is no nameplate on the generator end.

The Problem: Hooked it up the other night to run my boiler and it would
only put out 80v. I manually goosed the throttle/gov and it picked right up
to 129v and stayed there under load no prob ran it for about 4hrs. Next
morning it starts out ok but drops to 30v and stays there. Engine seems to
be fine w/constant rpms throughout. I can't find any shorts in the windings
, no burnt or loose wires the brushes look ok. I have no paper on this unit
and a Google yielded little of use.

I'm not sure what to test next,I have a multi meter/amp and can set up for a
load test but no scope. Any suggestions?

Andrew