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I have two NYC Subway engines that have be upgraded to PS3. Once the chains are loaded in, sometimes requiring more that one shot at it, everything is fine. Sooner or later the front Proto coupler stops working. You’ll hear the sound but the coupler won’t open. If you reload the chains again, it will work. It will be a matter of time before it stops working and needs the chains loaded yet again. Any ideas?

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Brian NY

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PS2 and PS3 couplers are the same.  PS1 couplers operate at a higher voltage.

Be carful operating PS3 diesel/electric boards with only one coupler and no load resister on the other.  It will blow the FET on the board.  The diesel board requires two coupler loads to operate properly.  It will fire a single coupler a few times, then blow the FET if another coupler or a load is not connected to the board.  The PS3/2 stacker board shouldn’t need both loads.

@Jon G posted:

Be carful operating PS3 diesel/electric boards with only one coupler and no load resister on the other.  It will blow the FET on the board.  The diesel board requires two coupler loads to operate properly.  It will fire a single coupler a few times, then blow the FET if another coupler or a load is not connected to the board.  The PS3/2 stacker board shouldn’t need both loads.

does this go for the board that would be used in a NYC subway engine?

The PS3 subways use the diesel PS3 board, so they need two coupler loads.  If it was upgraded from PS2 using a PS3/2 board, they can have one coupler load since this kit is also used in steam upgrades that typically only have a rear coupler.

The new AA, ABA diesels sold individually come with two proto couplers, but include a short dummy coupler to allow close coupling, but also include a dummy load to replace the removed rear coupler.

Obviously could be DIY'd given you had the standard connector and resistor.

https://ogrforum.com/...er-resistor-question

thanks for help on another thread regarding upgrade files.  I learned to re-read the instructions 6 times.  I found that the rear coupler must be hooked up or a 4.7k-ohm resistor must be used if a coupler is not attached.  I intend to use the rear coupler on the trailing B unit.  My concern is the inadvertent operation of the powered A unit detached from the trailing B & A unit would fry the PS3 board because nothing would be attached to the trailing coupler lead from the board.  1 answer is obvious, “ don’t run without anything attached to trailing coupler”.  Is this the only solution or are there alternatives to allow single and multiple engine operation on the fly?

From this topic the connector type https://ogrforum.com/...mth-2-pin-connectors

They're not JST connectors, they're Molex Mini-SPOX 5264 Connectors, pins are at the bottom of the page.

Also called

search for sbc-2 connector at All electronics for them.

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