Bypassing the pressure switch like this should make the igniter come on. When you say you shorted the two connectors together you mean you connected the two loose wires correct?
This should make the igniter glow unless the igniter is bad. By connecting these wires together we have eliminated the venting system from the equation.
The only thing is that you must allow the furnace to send the signal to the inducer motor to start up before you can short out the two wires. So it is essential that you start the furnace up with the two wires unhooked then after about 10 secs once the furnace power is restored you hook them together or the bypassing will not work.
Ok lets test the igniter.
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Unplug the igniter at it's little white male female plug connector.
Hook the pressure switch back up the way it should be.
Now let the furnace start up and see if you are getting 120v to that plug going to the igniter. With one lead on each prong of the plug it should show 120v.
Take in mind it takes a good 90 seconds for this signal to be sent to the igniter once power is restored to the furnace and the inducer motor comes on.