Paul,
           Is there anyone on this forum that has used the GM coils on their engines that can help me?  I have annoyed Tracy until he will be pleased to see that last of me as he is on holidays.  SO far I have the following information from him.  That the connections on all the GM coils are the same,  D 580, D 581 and D 585.  The male plug in fitting is the same for the D581 and the D585, but different to the D 580.  Then in Tracy;s installation guide on page 25 is shows the D580 coil with the external fastening latch at the bottom and it says that pin A is on the left.  Then over the page on page 26 it shows two photos of the coil D 581. The photo on the right shows the connections and if you put the external fastening latch at the bottom like the coil D580 on the previous page it says that pin A is on the right on coil D501 (page 26)  Can anyone clarify which pin or terminal on the D 585 coil or igniter is terminal A  Has anyone used any GM igniter (580 to 585)  and got it actually wired in that can clarify the above as once I epoxy the pins it will be too late to change  Neil

I have them in the RV4.

Don't epoxy them in. Use RTV aka silicone rubber. You can pull it out
if it is wrong.

Use the molex female round split pins to make connections. These are the same
power supply connectors used on computer mother boards. Go to a computer repair
place and get a junk power supply and salvage the pins. Use heat shrink tubing
over the pins so they don't short out.

Take some pictures of the coils you have so we can be sure you have the right
coils. The connector locations on the coils vary. The LS2 D585 and LS1 D580 pin
outs are swapped end to end.

The thing to do is get three AAA 1.5 volt dry cell batteries and connect them in series.
Tape them together with duct tape.  You should then have a 4.5 volt trigger voltage.

Wire up the coil you think the way it should go on the bench. There are only two
ways. Ground pins on the ends. Ground on right end or on the left end.

Plug in a coil wire with a spark plug on the other end. Ground the spark
plug metal part.

Ground the negative end of your 4.5 volt dry cell battery.  Use a 12 volt car battery
to power the coil. When you momentarily touch the 4.5 volts to the trigger input pin
the spark plug should fire. If not it is wired backwards. Swap ends.

I sent you the pin outs dwgs. Here they are again.

Paul Lamar