Limit switchs

Where is the other wire from the limit switches connected to ?
They should all be connected to 12V in your case, not to GND.

The wires used are green and white. The white wires run to the 7i77 card bottom row. The green wire runs to a 12 position terminal block. The 12 volts are run to the 1st 3 terminals. Each sets of wires run to each of the limits switches and one set of wires run to a e-stop switch that also doesn't work.

NC switches should give 12V at the Mesa inputs when not tripped.
Check the wiring.

tommylight wrote: NC switches should give 12V at the Mesa inputs when not tripped.
Check the wiring.

Yep and also, inputs must be 12V relative to field power GND = TB2 pin 8 when on

So if I put the meter on each pin. I need to put the GND on pin 8 of TB2? Each one should read 12 volts?

O.K. GND is different than -5v or -12v
TB1 pin 1 and TB2 pin 8 run to the same terminal and that terminal runs to the negative side of the 5 volt supply.