'38 Road King wiring question

[Davidcc]

I have an electrical wiring question concerning a stock '38 Plymouth Road King coupe with a 201cid engine and original gauges.  The only changes will be using a 12 volt, negative ground system with a 12 volt generator and voltage regulator.  I am using the wiring diagram from the Chrysler Corp.'s "Plymouth Shop Manual Codes P5-P6" (1937).

The Code P6 diagram on page 52A shows 7 wires and their groupings going to the Ammeter but does not show which of the 3 connectors these wires go to.  The accompanying sketch is my best guess as to the correct wiring.  Connector "C" has constant continuity to "D."  When a fuse is installed continuity is continued to "A" and "B."  The code P6 diagram states that wire #17, coming from the starter, is the "feed" wire so I've placed it at connector "C" in order to protect the other wires via the fuse if there is a problem.  Connector "A" and "B" are connected to the Ammeter coils and activate the needle for a + or - reading. So, can anyone tell me if my sketch is correct, and if not, what is the correct wiring.  Thanks. 

[D35 Torpedo]

Not sure, but I believe you have to reverse the polarity on the ammeter when changing system polarity.

[Sniper]

16 hours ago, D35 Torpedo said:

Not sure, but I believe you have to reverse the polarity on the ammeter when changing system polarity.

 

You are correct, if you want the ammeter to read properly, otherwise it reads backwards.

 

No idea on the wiring question though.  I usually use a generic hot rod style wiring harness and custom wire the vehicle.