Case vac wiring no spark

I have a case vac that I picked up a while back and its missing some electrical components. I just put a coil on it but Im not sure have a coil needs to be wired up if the negative goes into the connection of the distributor, or if the positive goes to the distributor and how it should be wired up since it was a 12 V system when I got it but it was missing some stuff and Im trying to keep it as a 12 V system and get it working how it should,I am getting power to everything but not from the distributor but I get power through the coil to distributor, but Im not getting power through my plug wires. If anybody has a 12 V wiring diagram or any tips on how to get this wired up, it would really be appreciated because Im struggling at the moment.

Pretty simple. The coil is one of two different designs (they look the same but differ in the amount of wire in the windings. A coil that is intended to be used with no ballast resistor is made to operate with 12v directly and have an Ohm reading from one little terminal to the other of about 3 to 4 Ohms. A coil that is intended to use a ballast resistor (in series with the coil input from the ignition switch) operates on about 6 volts and has a resistance of 1.2 to 1.5 ohms.
The use of an alternator on the tractor is a determining factor as to which way the battery is connected. Almost all alternators are negative ground and the battery is connected that way, negative terminal to ground. If equipped with a generator it could be either positive ground (as it was likely from the factory) or negative ground. If it is charging now, then the polarity of the battery is correct for the way it currently is.
Answer: The ignition circuit supplies the coil with voltage, the coil conducts this voltage to the points. The points and condenser in the distributor are a switch that makes and breaks the flow of electricity. (Kettering Ignition Systems for your perusal) the coil should be attached to match the battery polarity such that the small terminal on the coil attached to the distributor matches the battery Negative ground is negative coil terminal to distributor.
The voltage going to the distributor will only show up if the points are open. Your engine almost always stops with the points closed, as such if you test with a light it will not show voltage on the side connected to the distributor unless the points are open. Jim

Adam, good advice from Professor Jim.

When you say

I get power through the coil to distributor (that dont sound right)

USUALLY with ignition on tractor not running just sitting there you would see voltage on the coils INPUT from Ignition switch, HOWEVER, none on the OUTPUT to distributor because the points are closed taking it to ground.

If you were to place a 12 VDC test light on the coils output to distributor with ignition on and engine slowly cranked over it would flash ON when points are open but OFF when closed.

If theres ALWAYS power through the coil as you state, the points must be bad or not closing or the wires open from coil to dist

Work through my Ignition Troubleshooting can help find the cause of no spark

If its POS ground coils + output goes to distributor, if its NEG ground coils - goes to distributor.

http://www.ytmag.com/cgi-bin/viewit.cgi?bd=farmall&th=5745

John T
John Ts Ignition Troubleshooting

http://www.ytmag.com/cgi-bin/viewit.cgi?bd=farmall&th=5745
Ignition Troubleshooting

Many times I find, points both new and old, have an oil film if new or a slight corrosion film if old. A simple passing of flint sand paper through the points is all that's needed to restore contact action. That's provided all connection are correct.