Arduino Uno with Pololu Motor shield - erratic behaviour

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i have dual mc33926 shield on arduino uno.
i have 2 12v windscreen wiper motors connected shield
i have 2 12v batteries, 1 power arduino, other power shield
when run arduino , shield without motors connected appears correct (leds on shield light correct direction etc.)
when connect motors, runs ok maybe 1 or 2 cycles , erratic behaviour - 1 motor keeps running, or none run when should etc.
previous posts , googling suggests noise suppression capacitors (i have installed 3 per motor)
also have seen suggestions inline diode on arduino power line , cap across vin , gnd on arduino have done
i have separated power sources arduino , shield.
still erratic behaviour persists
i have swapped out shield have - same behaviour.
i have measured current drawn motors run , looks current peaks @ around 5.8 5.9 12v supply. decided try running motors @ 24v reduce current consumption, same symptoms present.
has got further suggestions ?

thermal cutout perhaps?  recommend adding heatsinks high current.


Arduino Forum > Using Arduino > Motors, Mechanics, and Power (Moderator: fabioc84) > Arduino Uno with Pololu Motor shield - erratic behaviour


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