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measure across the full +/- (should be around 48vdc)
is it really dropping?

disconnect the 0v interconnect and measure between supplies/rails.
is there a big difference between the grounds?

is there continuity between the ground prong on the plug and chassis and 0v on both?
if so thats a common ground, maybe not the best though.
 
what if you put a diode (1n400_?) in series with the output of rails--forward biased(?).
not a solution but maybe a remedy/bandaid?
seems something is not right with regulators.
 
try sense connected at the source to rule that out.
with the diodes, pull all but 1 module to give the diode a chance if you don't have big ones--just troubleshooting here.
 

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