I just measured a spare TT I had.
The brass nut has:
18°C 12sec
Made In Germany
4.75
150°C max
12V 40W
engraved on the side.
At room temp (21°C) the two contacts measured open.
It took ~ 3min in ice water before it switched and the resistance between the two contacts became 70ohms.
Basically the switch is closed only when it is darn cold. When closed the resistance is 70ohms.
One of the pins is tied to ground via a 70ohm resistor.
From the specs on the device, I assume it goes open at 18°C and it attains this temp after 12sec of 12V applied during cranking.
Hope this helps.
The brass nut has:
18°C 12sec
Made In Germany
4.75
150°C max
12V 40W
engraved on the side.
At room temp (21°C) the two contacts measured open.
It took ~ 3min in ice water before it switched and the resistance between the two contacts became 70ohms.
Basically the switch is closed only when it is darn cold. When closed the resistance is 70ohms.
One of the pins is tied to ground via a 70ohm resistor.
From the specs on the device, I assume it goes open at 18°C and it attains this temp after 12sec of 12V applied during cranking.
Hope this helps.
