I recall going over this a while back...see what you can find..all I've seen was one wire coming out....I'll check also
Its in Flo's testimony:
Stewrdess Schaffner 11/24:
Schaffner passed the note to Mucklow who called front. Schaffner went and sat by the man who opened the brief case and showed her a bomb.
He showed her a wire INSIDE the case and he said ‘touching this wire would detonate the bomb’!Cooper cracked open his briefcase long enough for her to glimpse eight red cylinders[19] ("four on top of four") attached to wires coated with red insulation, and a large cylindrical battery
The stunned stewardess did as she was told. Opening a cheap attaché case, Cooper showed her a glimpse of a mass of wires and red colored sticks and demanded that she write down what he told her. Soon, she was walking a new note to the captain of the plane that demanded four parachutes and $200,000 in twenty-dollar bills.
Hancock stated that the note the hijacker handed to Schaffner stated the hijacker had a bomb, in a briefcase he was carrying, and thathe wanted $200,000 dollars and absolutely no trickery or interference or he would explode the bomb he said he was carrying
I point is: there is no evidence that I know of that confirms FJ's claim there was a deadman switch. And even if there was Cooper obviously deactivated the switch when doing other things . . .
There is just nothing confirming a deadman switch. Its just another FJ idea and claim.