get another bob a descent bob will take 3.3v and boost it to 5v.  Will make it easyier to wire it up.

OK, this is like going no where quick.

I asked and they told me to buy the C36 board.  But there is no wiring manual.  I am not sure how to wire this, what is positive and what is negative.

Looking at this I am guessing that V_IN is voltage in so that should be the positive lead?

Not sure what you are showing there but it just seems to be relay outputs. If that is the case then it doesnt really matter how you wire it as it is just a switch, so if in your example above you put the +ve to the device, connected the other side of the device to the common (V_In it seems to be called) and then connected the NO to 0v (Gnd) then it would work fine. All that would happen is device gets 12v but as there is no path to 0v no current flows so device does not operate, close the relay and current can then flow so device works.

Hood

think of it as a light switch.  The center is the power coming in, and eith side is how it runs. Nomraly open or normally closed.

So say, you have 12v to the center lug.  Then another wire from NO to your device positive .  Then run your ground to its ground like normal.

The relay is nothing more then a light switch on either the positive or the negative line

the input side is where it gets it signal from the printer port.
If it gets a signal on the input side say its wired to pin 1 on the bob.  That fires the relay which completes the circuit to your coolant pump

here are a couple pics

Not sure what you are showing there but it just seems to be relay outputs. If that is the case then it doesnt really matter how you wire it as it is just a switch, so if in your example above you put the +ve to the device, connected the other side of the device to the common (V_In it seems to be called) and then connected the NO to 0v (Gnd) then it would work fine. All that would happen is device gets 12v but as there is no path to 0v no current flows so device does not operate, close the relay and current can then flow so device works.

Hood

Works, I had the wrong voltage powering the board.   Had a 3.3vdc line instead of a 5vdc.

Thanks for the photo but I am still not sure why this C15 board would not work but the C36 is working fine.  Arturo did tell me the C15 was not for coming directly from a parallel port. Happy it all works again.

here are a couple pics

this is what I ended up with.