Okay, this is relatively easy to do, but we all have brain farts once in a while.
On the FACTORY wiring, there are two ignition sources:
In START, current is fed directly to the coil (bypassing the ballast) via the IGN2 circuit (normally a brown wire).
When the key is released into the RUN position, IGN2 goes dead and current gets supplied by the IGN1 circuit (normally a blue wire) to the ballast and on to the coil.
Since your distributor requires a single voltage source in both START and RUN, the easiest way to accomplish this is to join those two circuits and use that source to feed your distributor.
You can do this one of two ways.
1.) Go to the ballast, and find the blue IGN1 wire feeding the ballast. Unplug it.
Now find the brown IGN2 wire that bypasses the ballast and goes to the coil. Cut the connectors off and solder them together, along with an extra pigtail of wire that is long enough to reach your distributor (or wherever you choose to mount the HO coil) and heat shrink or tape the connection. This pigtail is the new feed for the RTR distributor via the HO coil. Go back to the ballast, remove it, and throw it in the spare parts drawer. Tape off the lead (or remove it) that ran off the other end of the ballast. Disconnect the coil and tape off the leads, or remove them.
2.) Go to the ballast, and remove it.
Fashion a short jumper wire with male spade connectors on each end. Plug it into the 2 wires you unplugged from the ballast resistor. Tape it up securely. Disconnect the blue wire from the coil, this is now the feed for your RTR dist./HO coil.
You do have this pic, right?
View attachment 1716469437
The red arrow designates the wire that formerly fed your coil, or the pigtail you added to the splice depending on which method you used.
Either way, you are using the combined circuits to feed your new RTR.
Edit: Before you even begin, make SURE you have voltage in each individual circuit at the correct time: 12v in IGN1 with the key switch in Run ONLY, and 12v in IGN2 withe the key switch in Start ONLY. Any deviation from this indicates that you have additional problems elsewhere. Issues here will require further investigation and repairs before you proceed.
If it all checks out, then continue with the installation.
