Hidden Short

One thing that it might be is a winding-to-winding fault that doesn't touch ground, but nonetheless shorts across a portion of the winding. A line-to-ground megger test won't catch this, but a line-to-line resistance check could pick up significant differences among the three low resistances. For instance, readings of 1, 4, and 4 ohms would point to a short in the 1-ohm winding. Motors can sometimes be rewound for less cost than a new motor.

isolate each winding by separating the wires check for a short between them.

i figured as such, just so happens that this would be the second time this has happend and i just really wanted to know if i was missing something. thanks for the help fellows.

Check also that the fuses are "motor rated" and compatible with the motor's full load current on its rating plate. Check also that an overload trip device is in-circuit and correctly set to the motor's full load current. Check also that the cable downstream of the fuses is up to the job in terms of the local electrical code.

well found problem a few days ago. w/ the rebuild its hard to find time for the network and my family. anyways the heater block in-line w/ thestarter was bad. the insulation had broken down and cxould not handle the current passingthrew it. of all things!! thats the first time that had happend to me.