first thing I did with my twin was insert a diode in the pump, second thing was to change the rectifier. Now it will run for a million miles ...
knock on wood.
This said. Open the black plastic cap, check the contacts, sandpaper them, if this will work you need to insert an diode later on, better get a new set of this contacts from ebay for 20€, insert this diode, 0.5€ and it will last forever.
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