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re-wire the whole lot with 8AWG wire or heavier (shorten the wires on the peltiers as much as possible too and replace with the heavier guage) also a good idea to fuse it, an inline 20a fuse should save any major mishaps. the less joins the better too, as Bert says try to avoid push connectors completely. ideally you want to go straight from the supply to the peltiers.
all of this should be tested for a few hours prior to installing inside the scope!
its unfortunate that the wiring you had couldnt handle it, but that doesn't mean the advice i gave was incorrect or bad, especially considering the question was just directed to a power supply, not how to wire it up correctly.
I just took for granted that the rest of your setup could handle the current but apparently it didn't.
plus i didn't really appreciate the 'Well, I am certainly going to be more careful about who I listen to now.' line.
while i may not be an expert or know all of the technical jargon, i have used many peltier elements and used to have a job repairing and installing 12 - 24v medical electronics.
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