dash cluster help plz

[steveo3002]

mk2 polo 1988

my old cluster went to hell after id been messing with to cure a rattly speedo

so ive got another set out of a junker...most of the issues are cured but the blue headlamp main beam led/bulb doesnt work

ive swapped in another bulb and still the same...also when i operate the main beam stalk it makes the coolant lamp flash

any ideas as its driving me mental
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