A. Wrap the exposed wire, if you can locate it, with a piece of waste,
or if you cannot locate the short circuit, disconnect one of your cab
wires from the dynamo. This would give you the benefit of the arc lamp
and you can look for the trouble at your leisure.
38. Q. If the light goes out when steam drops back fifteen to twenty
pounds, what is the trouble?
A. Either one of the governor valves is stuck shut, short bushing No. 18
in engine cab is worn badly, allowing wheel to drop away from the
governor stand so steam passes around wheel to exhaust, or governor
springs are too weak.