means they're drawing too much current or else the overloads in your light switch are weak if it's an old original .... those are the contact point sets on each side of the switch

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature we find it attached to the rest of the world" John Muir
"When we tug a single thing on an old truck, we find it falls off" me
Some TF series details & TF heater pics & Rust-a-holics Unanimous parking lot