The first thing I would expect, is the wiring has a break somewhere leading to the low beam terminal on that side.
PS. Did you try plugging the new bulb into the known working plug to make sure the bulb is fine?
Ean www.thebluebaron.net
'87 Chrysler LeBaron coupe (The Blue Baron)
'89 Chrysler LeBaron coupe (Christine)
'02 Chrysler Neon LX (Lex)
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