i am embarrassed to say i too cannot recall the location of the glow plug relay in the mk3 (mine has never failed me). In the old system, the glow plug relay was (i think) number 54. In any case, it is a larger relay and it will have about 3 very large blades and several smaller ones coming out of it (unlike wiper/washer and blinker and headlight relays - it carries much greater current).
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