It sounds like the wiring you are describing is how a
1954 Chevrolet truck with a hydramatic transmission is wired.
Here is the
Wiring Diagram (To zoom diagram click on magnifying glass with plus sign)
The dashed lines are what you want to look at.
The dashed lines go to the,
Push button switch
Neutral safety switch (You might not have one)
Solenoid
Ammeter
The ignition switch wires:
One comes from ammeter.
One goes to the coil.
What year make model is your truck?
1954 Passenger car wiring diagram it has the same wiring but without Neutral safety switch.