I have a ‘64’ Mercury Montclair. It has a 4 headlight setup, I replaced the 2 inner headlights and there is no change. The lights work fine, until I step on the floor switch and I have no lights at all. Thanks in advance. Josh Lindstrom A.K.A. Godfather

Headlights go out when I switch to brights

Tester October 17, 2013, 8:45pm 3

Your vehicle doesn’t have a relay that controls the high/low beams. This is controlled thru the dimmer switch.

The dimmer switch requires replacement.

Tester