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Reply to "Legacy F3 Intermittent response to Aux1 smoke commands"

Follow up for those interested.

Looking at the AC regulator, it didn’t look like it would be too hard to replace, so I ordered one from Lionel, and I just finished installing it.

Short ending: the engine responds correctly and works fine. The regulator was clearly the problem as the gurus above thought. Thanks all for the great help again.

Two questions for the crew:

1. The regulator has sort of a black tab with electronic connections on it. On my matching B unit that tab is screwed to the frame with an insulator between it and the frame. On the A unit I was working on there does not appear to be a similar mounting hole, so I did not screw it down. Should I have? And what is that black “tab”? See the “long ending” below to learn why I couldn’t just match the old part.

2. Where is the 6 ohm smoke resistor that I see a lot of posts about? I thought about replacing it with an 8 ohm resistor as suggested, but I don’t see it. Is it inside the smoke unit? What is involved in replacing that?

Long ending: I ordered the part as shown above in this thread, which is exactly what Lionel showed in the parts view for this engine. But upon disassembly I quickly realized that someone had repaired this before, and used a different regulator part! It didn’t look like the new part, and had a different number. They had used shrink tubing and simply spliced all the wires matching colors. I probably should have done the same, but decided to use the pin headers as provided on the new part. Luckily I also have the matching non powered B unit so I opened that and used that as a reference. The only tricky part was adding the brown wire from the other electronic module to the pin header that goes to the truck, but I figured that out well enough. I will say that in this case working with fine gauge wire and small connectors, being near sighted was an advantage.

OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

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