Sounds like resistor in key is bad
If you lights do not dim when turning key, then probably your starter.
how to replace starter for a 2002 buick rendezvous
you may have a loose wire to starter
In a 1995 Buick Roadmaster, the starter is located on the passenger side of the engine, mounted to the transmission bell housing. To access it, you may need to lift the vehicle and remove any components obstructing the starter, such as the exhaust or heat shield. The starter is typically held in place by a few bolts and connected to the battery and ignition system.
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If your 1994 Buick Roadmaster's starter won't engage, several issues could be at play. First, check the battery to ensure it’s fully charged and the terminals are clean and secure. Next, inspect the ignition switch and starter relay for faults. Additionally, the starter itself may be defective or there could be an issue with the wiring or connections leading to the starter.
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key reader in steering column.
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