So why does the ei core 9v try work the pump and the 24v charger won't make pump come on .. ?? Bit confused
See my response on your other (duplicate) post, repeated below. Please refrain from posting the same question or problem more than once.
Short answer: the pump is an AC induction motor. It does not run on DC.
Long answer: copied from your other post below.
You have two choices: (1) Purchase a step-down transformer that converts your 240 VAC mains to 115 VAC and mount this transformer externally, re-connecting the original transformer inside the base that converts 115 VAC to 33 VAC and powering this original transformer from the external step-down transformer. (2) Find a step-down transformer that converts your 240 VAC mains to 33 VAC and replace the original transformer with this new transformer. From a practical point of view option (1) is the quickest and simplest solution. You are not likely to find the transformer required to implement option (2).
You cannot connect any sort of DC power supply (which is what the black brick in IMG_3633.JPG is!) to your cake water fountain. The LEDs obtain their power from circuitry operating from the 33 VAC secondary of the original transformer. The water pump is a shaded-pole AC induction motor and requires 60 Hz alternating current at 33 VAC for proper operation. It will probably work okay (at reduced speed) on 50 Hz, but it definitely will not work properly at 9 VAC with the transformer shown in IMG_3630.JPG.
Option (3): You could purchase
four of these transformers and connect their secondary windings in series, paying proper attention to phasing, to obtain 36 VAC. You would connect the four primary windings in parallel of course to operate all four transformers from 240 VAC. I have no faith that you will be able to determine how to connect the secondary windings in series in a manner that causes their voltages to add, so I cannot seriously recommend this as an option. Four of these transformers will probably not fit inside your base so they would have to be mounted externally. That brings us back to option (1) using the original transformer and an external step-down transformer.
However, if you want to use four 240 VAC to 9 VAC transformers, we can instruct you on how to properly wire the secondaries in a series-aiding manner to obtain 36 VAC.
Good luck with the wedding preparations... and try not to burn the reception hall down with an electrical fire!
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