why would a motor blow a controller

[CartTrader]

Originally Posted by Sergio

The test you did with the motor in the cart, putting the coils in parallel, should have eliminated all of the conditions mentioned(unless you have some fancy compound motor...).
The shunt motor would run very slow at 24 volts, that should be normal.
To perform some bench testing:
Put your multimeter in a low ohms setting and test the following:
A1-A2 = low resistance.
F1-F2 = low resistance but it should be more than A1-A2
A1-F1 = open or infinite resistance.
A1-motor body = open or infinite resistance.
F1-motor body = open or infinite resistance.

Did above testing...Results:
A1-A2 = low resistance. .......... .9 ohms
F1-F2 = low resistance but it should be more than A1-A2........2.3 ohms
A1-F1 = open or infinite resistance.............Open
A1-motor body = open or infinite resistance.............3.5 ohms
F1-motor body = open or infinite resistance...........Open

Could A1-motor body be the problem?

CartTrader

[Volt_Ampere]

Yes. A1 should not show anything but OPEN to motor body.