Talk Morgan Forums Morgan Sports Cars Classic Morgans (pre-CX) wipers and fuses

If the wipers and controls work fine and just the fuse blows then it does seem likely the motor is being overloaded particularly if it only happens on fast wipe, so run through lubing the whole chain from motor to wiper. You could also feel the motor for hotspots immediately after fuse blows which may point to a bearing issue. Try and get some oil or thin grease into the cable that actuates wipers via individual quadrants. Check also grease in motor as suggested above as that can dry out and turn lumpy over time, so remove old and add new if needed. For this reason wiper motor loads are usually higher in the winter.

If needed this is the Lucas 14W wiper motor you are looking at replacing. Note the parking direction nomenclature.