How to wire a PPTC polyswitch + blown indicator LED to protect a bi-directional DC motor from stalling?
Use a bridge rectifier to feed the LED. The closed loop comes from the low dc resistance of the motor. – Andy aka


  Can you draw what you're discussing and put it in an answer?


Unfortunately I have no drawing facilities at the moment so I’ll try and describe...

Treat the voltage across the polyfuse as AC. Connect the polyfuse terminals to the AC terminals of a bridge rectifier. Connect the appropriate LED to the DC output of the bridge rectifier.

The LED you have chosen ought to be able to work down to 9 volts but, if it can’t then use a regular LED in series with a resistor.