Electric rear window conversion help

Hi everyone.



I have myself a ZS 180 mk1 on a 53 plate. I recently purchased everything I needed for a rear electric window conversion. This included:



Regulators

Window looms

Rear switches

Centre console switches



My ZS had the wiring loom pre-installed for the conversion so couldn't see any problem with fitting them, simple plug n play.



However on connecting all switches and plugs the regulators would not work. The parts have been tested working by a well known and respected seller.



What could it be? I thought perhaps fuses or relays but very much unsure.

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