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The 72 had an external coil plus a load resistor bypass circuit. You should consult your Haynes manual which has excellent electrical diagrams, or your Assembly & Installation Manual (AIM) which shows actual wiring drawings.
I don't have my manuals with me, but there should be one wire which comes from your ignition switch, and one wire which comes from the starter solenoid that both connect to the + (plus) terminal on the coil. There should also be a wire from the distributor points which goes to the - (minus) terminal on the coil.
You may also have a condenser (small cylindrical device that is bolted to the coil mounting bracket) which has a wire coming from it and should be connected to the - (negative) terminal of the coil. The condenser is not necessary, and some units have the condenser in the distributor itself, or the condenser is bad and should be removed/replaced with a good one. Check with a parts place to see if they list a coil condenser.
You may also have a condenser (small cylindrical device that is bolted to the coil mounting bracket) which has a wire coming from it and should be connected to the - (negative) terminal of the coil. The condenser is not necessary, and some units have the condenser in the distributor itself, or the condenser is bad and should be removed/replaced with a good one. Check with a parts place to see if they list a coil condenser.
On a 1970 the coil mounted condensor is for the Radio for suppression or something like that. ~Juliet