For some reason, I've been struggling in replacing a decoder in my USRA
Mike. I've always reached the point of everything doing fine until
putting the boiler and tender shells into position. That's why I had
asked about the capacitor a couple of days ago. I've found the
problem! It was with the LED headlight. I had used a 3mm with the
leads snipped short and run into the boiler front--I had coated the wire
leads with liquid insulation. It had worked in the past, but when I
hooked it up Tuesday evening the engine's chuff sound went crazy with
the engine just sitting there. Is is sort of like if you turned on the
water in the bathroom sink and your outside sprinkler system turns
on--in other words it didn't make sense!
Anyway I unplugged the headlight wires and things were okay. So I then
removed the LED and installed one of those surface mounted
super-miniature units as a replacement. I re-installed the boiler last
night and things are pretty much solved. I did burn out the forward
headlight function, so I've reversed the engines front to back CV and
now use the rear light function as the forward light--a few minutes of
work but it saves a repair session back to Durango. Tonite I'll add the
pilot and trailing trucks and be running trains again--fingers crossed!
I've done many successful DCC installations but this one was pretty sneaky.
Bob Werre
BobWphoto.com
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