Youtube is quicker than explaining, two types so I found both you can check resistance of all the glow plugs from the relay wiring if it is easier also resistance should be 0.5 to 2.5 ohms on e46 :) https://www.youtube.com/watch?v=rTfV01vphaI&ab_channel=Straight_To_The_Point
https://www.youtube.com/watch?v=K_ag_FQvSMY&ab_channel=Przemys%C5%82awWilkutowski
Well bloody hell, the gift that keeps on giving - cheers man!
@Nef started
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Youtube is quicker than explaining, two types so I found both you can check resistance of all the glow plugs from the relay wiring if it is easier also resistance should be 0.5 to 2.5 ohms on e46 :)
https://www.youtube.com/watch?v=rTfV01vphaI&ab_channel=Straight_To_The_Point
https://www.youtube.com/watch?v=K_ag_FQvSMY&ab_channel=Przemys%C5%82awWilkutowski