The replacement potentiometer speed controller switch, could these be used instead of the on/off button, although the original micro switch is an ‘operate and release’ type whereas the switch on the potentiometer would be permanently on or off.  Also is the potentiometer/track strong enough to cope with the continual operation to control the trolley instead of using the on/off button?

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I have a problem with the speed controller.

Without notice it goes from 4 on the screen to 7 then back to zero for no apparent reason. A bit disconcerting if your walking along at leisurely pace to be dragged forward for no reason then you come to an abrupt halt. Can be reset but does exactly the same minutes later.
Switched it off but pretty heavy to push for 16 holes like today. I think the switch has gone it’s sealed so no way to check it out.  Help any suggestions.

There can be a couple of things that cause this. Most of the time it is the speed control switch that causes erratic speed. The reason is that this part is particularly susceptible if it gets a knock or a bump especially because it sticks out from the handle and can easily get a side knock, which takes it off its resistance tracking. So to check this I always recommend testing the speed numbers up and down and it should operate smoothly all the time.

How the speed control works

With regards to the speed switch control. I believe the spare pair of contacts on the speed control switch (potentiometer) is for the click stop, but these don’t work with the current models of electric golf trolleys or their controllers. I believe the Potentiometer track and wiper can take the continual use of sweeping the complete resistance track.

Damage and testing the speed control

This I know as I have been using it myself for the last few years without a problem. Nearly all problems for the speed control switch arise from them getting a knock, this can then cause the component to miss the track when rotating around due to the damage to the stem angle.

There is a full description of this spare part and how it functions.  Also on this page, you will find more details on Testing and Fitting the Speed Switch.