Correction - Schematic here:

http://rottendog.us/WPS079.pdf

Looking at the WMS schematic and Rottendog, J86 seems the likely connection point, is that the 2-pin molex and 4 un-soldered pins near the bottom of the board?

Looks like the power goes from J89 through the red thing (must be a transformer) to CN8, essentially the entire lower right section of the board is for the GI.

But check your references, I'm a software guy...

Apparently the 6.3V stuff puts a strain on the System 9 PS, more than one of them I have has had the 6.3V wires soldered directly to the board, bypassing the connectors. The connectors are often toasty brown and nasty so I assume they just don't do well with the load.

On my Sorcerer (sys 9), I purchased a molex connector set, soldered one side to the (stock) PS and then connected that to the output from the transformer so that at least I could connect and disconnect it without a soldering iron or a wire nut. It looks like that J86 molex is intended to do that as well if you can find the correct mating connector.

It looks like it might be this one: Part Number: 19-09-1029 http://www.greatplainselectronics.com/products.asp?cat=95

Most ops gave up replacing that connector, and just soldered the wires to the board with 2 wire nuts for removing the head.

If you switch to LED lighting, you should be fine with using the connector.

Put your meter on it and make sure you have the correct voltage evident before you solder anything.

Yeah, I see now, it's not obvious at all, more data:

See the Comet manual http://mirror2.ipdb.org/files/548/Comet_manual.pdf page 31, bottom right section is the GI. 3J9 pins 1 and 2 are the GI inputs, RottenDog seems to have labelled their connectors in corresponding fashion, so 3J9=CN9

I can't see CN9 on your picture or on RottenDog's, but if you refer to the Comet and RottenDog schematic, one side of the GI goes directly to 3J8 (CN8), and you can see that visibly on the board, it's a huge trace directly through the 4 pins I assume are CN9 to the 2 pin molex connector, which pretty much has to be J86 based on the RottenDog schematic.

I'd verify the voltages on the 4 pin connector, pins 1,2 should be one side of the GI and 3,4 the other side and between (1,2) and (3,4) there should be approx 6.3VAC. If you verify that, at that point you should be confident enough to take some alligator clips and briefly attach pin 1 or 2 to one side of the molex and 3 or 4 to the other and see the GI light up.

I sent RottenDog an e-mail with a link to this thread: [email protected]

From Jim @ RottenDog:

Somebody did a hack to make your machine work with a System 11 power supply.

If you follow the plug you are holding back from the connector, it will turn
into a 2 wire harness. These two wires get plugged into the 2 pin connector
just to the right of CN2X6. You are going to need the connector housing and
2 pins. They are:

WPS079 2 Pin Connector that mates with this board is 0019091026

Mating Pins 02-09-1104

I am thinking of buying a Rottendog WPS079 power supply for my Comet. Where can I purchase the pin connector (0019091026) and mating pins 02-09-1104?

0019091026 --> actual Molex number = 19-09-1026. Use 19-09-1029.