Electric Box below the coil

D

dac

Junior Member
I just bought a new wiring harness for my 1930 Ford and was wondering if when wiring to the junction box on the fire wall below my coil, does it matter what wires go on what side of the box or are they interchangeable? see photo
 

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To start off, it looks to me like your coil is mounted upside down compared to the conventional way a coil mounts. Correctly mounted (terminals down) that puts the + and - coil terminals immediately above the connector box. Wires would logically go out of the opening most convenient to what they are connecting to. So the wires from the wiring loom from the generator go into one of the side openings, the ones to and from the ammeter go through the same top opening (usually the pasenger/right side of the connector box), and the one to the coil goes through the opening nearest the coil terminal you connect it to (usually the left/driver side of the connector box).

Just be sure to follow a wiring diagram so that you get the proper wires bound to the same terminal in the connector box. Both terminals are hot, normally, but they connect through the ammeter.
 
The minus side of the coil goes to the driver side, and yes turn the coil so the high tension lead is pointing down.
 
Follow the wiring diagram. Turn the coil around.

If a diagram didn’t come with the harness, you can get one on line. Follow it!
 
Ignition coils in the 1920s were made differently from now. To demonstrate that, hold one of each coil near your ear and give it (the coil) a shake. The old one will not make a sloshing sound like the modern one. The old ones could be mounted with the terminals down but not the modern ones unless you are OK with coils failing. In my first year of Model A ownership, I had 3 coils let me down so on the advice of an experienced owner, I turned it over. No failures since. Epoxy filled could may be different, I don't know.
For authenticity, terminals down. For reliability, terminals up. It's up to you.
 
Yes, it matters how you connect wires to the Terminal Box. This slide should help.
 

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Why does your diagram say: "Original 6 volt negative ground primary electrical system."?
 
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