LimaFoxTango
The old notes are really getting a good dusting!
According to the training manual, on carrying out the Autofeather test, relays 6121-K15 or K16 are energised, in which case the bleeds would be turned off. Basically, if the Power Uptrim light is on, then the opposite bleed from the feathered engine will be off, as the light is fed off the same relay(K15/K16).
I'll be interested to see if this is correct in practise. I must admit that it's ten years since I last worked on the Dash 8, but the series 100 and 300 were good aircraft once you got used to them. We did have a lot of problems with the autofeather, but certainly careful maintenance of the engine harnesses made life easier. The Delastek test set was magnificent, as it found faults on the TSCUs that the overhaul agencies couldn't find, and was pretty good at finding harness problems.