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| p.1 #2 · Sunpak autozoom 344D - safe for Canon Digital Rebel XTi? |
According to the Digital Photography Answers database, the 344D has a sync voltage of 6 volts, which is safe for the Rebel.
You may need to re-form the capacitor to get it to come up to a full charge if it's not lighting the ready light. Either that, or the ready light could be broken. To test it, charge it for a longer-than-usual time and then take a test shot of a gray card. You should then be able to read the shot with Photoshop or similar software to see if you get a middle gray reading.
Of course, if you can't get it to fire at all, that's another matter.
Hope this helps.