Problem starting 1991 Park Avenue

The behavior is erratic. Sometime it starts with no problem. Other times, even though the battery is fully charged, it will not even turn the starter and displays the Security light on the dash.
The Buick dealer says it could be one of several problems with the key lock/switch. However, they describe it as expensive($200-300). Has anyone had this problem and how was it fixed?
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"Jack" (1991 Buick Park Avenue)
The behavior is erratic. Sometime it starts with no problem. Other times, even though the battery is fully charged, it will not even turn the starter and displays the Security light on the dash. The Buick dealer says it could be one of several problems with the key lock/switch. However, they describe it as expensive($200-300). Has anyone had this problem and how was it fixed? ________________________________________________________________
Clean the battery posts and cables, then post again if it doesn't help.
Rodan.
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