About to swap resistors in a PE smoke unit, have a question...

Jeff-

I'm thinking the coating on the wire is heat shrink tubing. If so, it isn't needed.

-John

Hi Jeff,

If the smoke unit your working on is a mechanical puffer unit you must protect the positive side of the resistor,or it will short out. Use heat shrink wrap

Alex

Yes it's a puffer. I swapped the 30 ohm for a 27 ohm put it back together and I could see it arc. I used the wrap off the original but apparently its not in there quite right. Off to the store in the AM. Do you run the shrink wrap all the way to the edge of the resistor?

Thanks Alex.

Hi Jeff,

Yes put the shrink wrap all the way until it hits the resistor.

What I do is, I double wrap the positive side of the resistor

with two pieces of shrink wrap.The first one is smaller than the second

one.

Alex

Great tip!! Thanks again...

For a conventional locomotive, I'd try a 22 ohm resistor.  I was really happy with the difference in the Dockside switcher after changing the 30 ohm one for a 22 ohm one.  Make a large difference.

Alex has you covered on the heat shrink, I also put back the white sleeve that covers the heat shrink on the original resistor.

Thanks GRJ!