intermittant operation GG 1 4907 6-18313

I couldn't quite follow your narrative, but in general, there are two things to keep in mind with this locomotive.

1) That particular GG1 has a problem with the truck magnets rubbing against the drive wheels. This thread has some details: https://ogrforum.com/...-lionel-gg1-question

2) You MUST install the pantographs on die-cast GG1s for the TMCC to work reliably. They serve as the antenna for the electronics, otherwise you'll get intermittent or no operation in TMCC mode.

TRW

I purchased the same loco a couple of years ago.  As TRW mentioned, the magnets had come loose and were rubbing against the backs of the drive wheels.  

I was able to reset them with epoxy.  I used JB Weld.  But if you decide to do it, be sure to place cardboard spacers between the backs of the wheels and the magnets.  Use the type of cardboard found on the backs of writing tablets.  It's dense enough not to crush.  

Mine has worked flawlessly since.  

Dan, very useful information.  I disassembled and found only one magnet rubbing wheel I did noticed these are staked in. This is a good start. I still have the question as to location to plug green pantograph wire. Mine was disconnected. also informed pantograph is also used for antenna? I assumed its for a centenary system. maybe both but it did run without them. anybody know location of pin to plug in green wire? Roy O

If the green wire you're referring to is the one that's connected to both pantograph lugs on the inside of the shell, then it gets plugged into the one solitary pin on the corner of the board.

TRW

Thank  you much   Roy O

Do I understand correctly that this GG-1 does not run in a conventional mode only TMCC ?   Roy O 

All TMCC locos will run in conventional, and your GG1 is no exception -- provided the magnets aren't preventing movement by rubbing against the back of the wheels.

TRW

Besides what is stated making sure program switch in run position for conventional and TMCC after programming.  As stated having antenna wire connected for reliable TMCC.  The other issue is with Pulmore motors and this has two.  Need to ensure the are lubricated and spin freely.  I think the last time I worked on this type of engine I had to remove motors, regrease and oil lightly the trucks making sure they spun freely.  Followed by motors.  Sometimes a misalignment of the motor top can also cause poor motor performance contributing to poor operation.  G

Up date. Repaired dragging magnet and retested. Worked every time in TMCC and responded to all commands. What few it has.  Non TMCC mode it would always move in one direction and only a couple times went into neutral and reverse. O well better of than a non run.  Thanks all for the help.   Roy O 

When you tried to run in non-TMCC mode (AKA conventional mode) did you turn off or unplug the command base?

Roy O posted:

Non TMCC mode it would always move in one direction and only a couple times went into neutral and reverse.

What transformer are you using? Some electronic transformers don't fully go to zero volts, which prevents the electronic reverse unit from cycling.

Try this... power up your transformer, and then disconnect one of the track wires and reconnect -- this will sequence the reverse unit. If your loco changes directions properly using this method, then the problem is your transformer.

TRW