High beams on dim

[Bob Lawrence]

Hi group,
Has anybody had this problem?
Turn on headlights and low beams come on ok, but high beams also come
on very faintly.
So far have had replaced dimmer switch, headlight switch, all 4
headlights but no go.
If take the low beams out, the high beam goes off..plug in low beam and
high comes back on. This holds true for both sides.
Any thoughts?

Bob Lawrence
84 PT 36
On the road fulltiming