headlights not working

So on the headlight switch.
engine off, lights off.
Black wire shows 12.20 and two pinks show 12.20
engine off lights turned on I get 11.2 on the double pinks,12 on the black,10 on the brown
engine on lights on I get 12 on the black, 10.5 on the pinks, 10.5 on the brown and 10.5 on the yellow and black combo.

All this with nothing coming through the dimmer switch. I am not getting any readings off the dimmer switch.