Here is my 2 cents worth....
In the picture that you posted the gray and green wires are tied together with a post terminal. That post terminal normally goes on the negative side of the ammeter (charge indicator).
The other end of the gray wire connects to the "bat" terminal of your voltage regulator. The other end of the green wire connects to the "bat" or (B) terminal of your key switch. Now normally when you turn your key switch from off to start or run, you are applying battery voltage to the other two terminals of your key switch which are "start" (or S) and "ignition" (or I). For anything to happen when you turn the key you have to have battery voltage on the "B" (or green wire). So you are probably saying "How can I have battery on the green wire when the other end is connected to the negative post of the ammeter"? And I would say to you "if you had an ammeter in there the other post, the positive one, would have a wire (probably red) going from it to the big lug on the starter solenoid, the same lug that the battery connects to. To simplify, 12 volts starts at battery positive side, to one side of the solenoid, to and thru the ammeter to B on the key switch. When you turn the key to start, B connects to S and I and you have liftoff...... PROBLEM....with no ammeter you have no 12v to B, no solenoid operation, no ignition, no liftoff. All an ammeter does is give you and indication of how much current is flowing through a wire in one direction or another by taking a sample of the total current that is going through it, so in reality it is just a straight piece of wire with some circuitry inside to do the sampling. So the simplest thing to try at this point is just connect the gray/green terminal in your picture to the + term of you battery and I predict liftoff. If not, look for voltage on the little (center) terminal of the solenoid while holding the key to the start position. If no voltage there pull the connector off the safety switch and short the plug connectors with a paper clip. If still no voltage it has to be key switch. If you have voltage on the little terminal of the solenoid while holding the key to start and it does not click, the solenoid switch may be bad. Good luck.
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