#90 switch

Pat,

It's not one line, but three wires. Try this (marked up from Page 17 of "How to Operate Lionel Trains and Accessories, 1954"):

Mike

@Pat K posted:

Does the ground wire from the accessory go to the 90 switch or go directly to the u post on the transformer

If that's all that's connected, it doesn't matter. As your railroad grows, you will want to establish a convention, typically along the lines of switching only the "hot" side(B on the CW) and keeping the commons/grounds(U on the CW) connected.

It gets more complicated if you get into using SC-1 & SC-2 for TMCC... a whole 'nuther discussion.

Mike. So I should have power on the hook up of the A and C posts.  I don’t need to turn the throttle on, right?  
I just checked continuity I have power on the connection from the 1033 to the 90, and I’m getting continuity between the 90 and the gate, but nothing is operating when I push the button.  What’s the missing link. The switch?

Try it w/o the switch first to see if everything is working.

Yes.  No need to turn on the throttle.

Here's a quick method for checking the switch: Take a paper clip or short piece of wire that has stripped ends, and apply it to touch both terminals on the switch simultaneously.  You'll be bypassing it electrically.

The gate should activate as long as you hold this "temporary circuit" in place, and release when you pull the paper clip/wire off.

Mike

I appreciate the help and I must have been born under a dark cloud.  The gate is not working.  Probably headier least complicated accessory that I have is not working.  I apologize to you.  Let me try this out with something that works