MTH PS2 allegheny schematic wire harness pcb w/2diodes

JimmyT posted:

ATTENTION GUNRUNNERJOHN  MTH 30-1116-1  PS2 ALLEGHENY RK  CAB #1604 FINALLY RECEIVED 10 PIN TETHER MTH AG-0000039 W/O DIODES TO REPLACE ORIGINAL BOARD. SINCE THE TRACES WERE RUBBED OFF CAN YOU TELL ME WHERE THE FEED TO THE DIODES IS,  OR A SCHEMATIC OF THE PCB W/2 DIODES  (THIS ENGINE APPEARS TO BE A POSSIBLE UPGRADE PS1 TO PS2) THANKS FOR ANY HELP

 

Why are you yelling?????

Sorry for using upper case letters. Thank you for informing me that means yelling.

Jimmy, the anode of each diodes go to one of the motor leads, the cathodes (stripe) are joined together and connected to the purple wires (PV) to reconstitute the PV voltage in the locomotive.  This saves them a wire in the tether.

Many times I have to remove the diodes to shrink the board in some upgrades, I just wire them direct to the motor and connect the purple wire to them there.

GRJ, when you say, the anode of each diodes, "go to one of the motor leads", are you saying only one motor lead gets the diodes attached (the diodes connected to each other in parallel), or a diode to "each" motor lead? 

no one end of each of the 2 diodes lead goes to each of the 2 motor leads from the diodes the other ends of the diodes are connected together and you connect the purple wire there to just as John had said!

that's how the PV voltage is created and is used to power up lighting n smoke!

What he said.

Alan Mancus posted:

no one end of each of the 2 diodes lead goes to each of the 2 motor leads from the diodes the other ends of the diodes are connected together and you connect the purple wire there to just as John had said!

that's how the PV voltage is created and is used to power up lighting n smoke!

But what do you do if you are COLOR BLIND?????Which wire is the purple one????LOL!!!!!!!

then  you ask Kenny for help!

Thank you Alan. I thought John had meant each motor lead and didn't want other readers to get confused. That's why I asked, because it does say "one" motor lead, not each.

kennyb posted:

Alan Mancus posted:

no one end of each of the 2 diodes lead goes to each of the 2 motor leads from the diodes the other ends of the diodes are connected together and you connect the purple wire there to just as John had said!

that's how the PV voltage is created and is used to power up lighting n smoke!

But what do you do if you are COLOR BLIND?????Which wire is the purple one????LOL!!!!!!!

Hook them up until you don't see smoke!

Dave Zucal posted:

Thank you Alan. I thought John had meant each motor lead and didn't want other readers to get confused. That's why I asked, because it does say "one" motor lead, not each.

I DO MEAN EACH MOTOR LEAD!  The anode on one diode goes to one side of the motor, and the anode of the other diode  goes to the other side of the motor.  The cathodes are connected together to create the PV voltage.

If they were to be connected together, that wouldn't make much sense, the two diodes would be in parallel.

Thanks  John, I understood what you said.