Euro lights into 4KCSQ

[Britt Grannis]

I just got my German H4/H1 headlights and am attempting to install them. I
have the wiring harness for my old H4' with relays already in place.
My question is ( please bear with me I'm really dumb with electronics) I can
plug (3 prong) in my existing plug into the  large (for lack of a better
description) part of the light but I don't have anything to plug into the
inner part of the H1 (I think) of the lights. Any BTDT advice or should I
get out there with my 12 circuit tester and find out what wire activates the
high beams?
Thanks,
Britt
Hillcountry Water Treatment