Why do my lights only work in one direction?

[Father Dougal]

Hi, I have just built a Tower models class 20.

I have fitted an old RJH light kit which uses grain of wheat bulbs.

I followed the wiring diagram and even colour coded it so I was less likely to make a 'cook up'.

The lights only work in one direction. I have the front yellow lights and a set of rear red lights working. The opposite lights for each end are misbehaving.

 

I can't figure out where I went wrong.

 

Any suggestions?

 

Please reply using simple instructions. I can build a loco but electronics are a dark art to me!

Dougal

Edited March 24, 2018 by Father Dougal

[RAF96]

You probably have the diode at that end in back to front.

[Father Dougal]

Aha, fixed it! Turned out I had a teeny weeny bit of solder causing a short at one end. Quick clean up and now runs fine in both directions.

Dougal.