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MK2.5 2.0 petrol new aux belt slipping


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Hello all, newbie here.

Bit of an obscure issue: I put a new aux belt on a 2009 ford focus, 2.0 duratec he engine. The new belt screams on high alternator usage (headlights and screen defroster turned on for example). Car has no sign of battery or alternator issues. The manuals I can find suggest the belt should have an automatic tensioner, but instead the car has this which seems to only be a pulley and has no adjustment, manual nor autonatic.

the existing pulley I believe is this https://www.ebay.co.uk/itm/Genuine-Ford-C-Max-Focus-MK2-Drive-Belt-Tensioner-Pulley-Kit-1465253/272376270305 and the auto adjusting one that shows up when I search for a replacement is this https://www.ebay.co.uk/itm/FORD-FOCUS-Mk2-2-0-Aux-Belt-Tensioner-04-to-12-Drive-V-Ribbed-INA-1251661-New/332450482629 which I don't think can fit as the mount holes aren't in the same place and are much deeper. I'm considering trying to find a larger pulley wheel but I'd like to know if I'm doing something wrong?

thanks in advance for any help!

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belt is the same size and part number as the old belt (though this was squeaking too), I think 1250mm. I cut the ac stretch fit off, pivoted the top pulley and removed the old belt,routed the new belt and pulled back on with the pulley, I didn't see anywhere to tension the belt, but I could have missed it

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