Given that my next step would be to check the amperage trace pattern on an oscilloscope.
easy test if you have the equipment and usually conclusive.
The difference in patterns between a good motor and a bad one are self evident.
I had an S type jag in a few months back with exactly the same symptoms,
'Scoped it to find the motor drawing way to much current,
The motor was actually OK but the wiper arm spindles were seized solid so the motor was fighting to move them,
So excess current excess heat and this tripped the motor until it all cooled down.
As stated the 'scope will show up any internal motor faults.
Posted on Thursday 22nd of December 2016Don't understand this? Ask a question