ramps 1.6 + servos ? (3 replies)

Hi,

I just bought a ramps 1.6. It seems great, but when I plug my bltouch in servo, nothing lights on...
With my multimeter, there is no 12v between + and - but 0v...
So is there something to do to have power on servos ?

I see 2 pins with no connectors J4 (betwwen the two green connector) is that the solution ?
I find nothing about this ramps 1.6

Thank a lot.