Magsafe will not charge...is this correct?

Hello all,
I have a 15" 2008 MBP and just bought a 13" unibody. I just discovered that the power adapter for the 13" will not will not charge the 15" or even illuminate the LED on the Magsafe, whether running or not. Is this to be expected? I had believed the adapter would at least be able to charge the 15" when the machine was not running.
The converse of this (15" supply on 13") does work, although I don't plan to do this regularly.
Thanks for any ideas on this situation!

bliberty: It should work: you should be able to charge the 15" machine with the 60W (not 65W) adapter that came with the 13" model, at least when the bigger machine is not running and no bus-powered peripherals are connected to it. Unfortunately, if everything works properly when the right adapter is used with each machine, there's no malfunction that Apple is likely to help you with.
I would reset the 15" machine's SMC and then try it again.
http://support.apple.com/kb/HT3964

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