Thanks, guys! I've been looking for the service manuals but couldn't find them. I really appreciate the help.
Turns out the problem wasn't the bulb, but a corroded connector. After some minor work, the turn signal is working just dandy. The fellows at the local scooter emporium took the bike apart and corrected the problem -- but didn't charge me a dime. I love scooter people! They're a lot like airplane people.
By the way, are any of you active on scootforum.com? I registered yesterday but have not received my confirming e-mail and cannot find any way to contact anybody there. Can anyone suggest something that might help? I've never seen a forum where you couldn't get in touch with someone for help, but I guess scootforum might be the exception to the rule.
Thanks again,
Bruce