I finally wired 2 of my Williams locos in series, what an improvement! They run nicely at 10 volts and the sound works better. Also they don't slow down when the when the horn or bell is used. I'm wondering if I wire my RS3 in series if the diesel sound will be louder as it can be operated at a higher voltage. Does anyone have an idea why Williams wired their locos in parallel and not in series?
Thanks for the response, brr. I think you should keep those F7s.