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car has dead battery and shakes when idle

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Is there any after market electronics installed, amps, remote starters, etc

Is the check engine light flashing or on?

Was the replacement battery new?

Have you checked for codes that have been set by your on board diagnostic computer, if no check my signiture and follow the directions to check for codes and post any here

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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I would measure the voltage, at the battery terminals, when the engine is running (should be in the 14 to 15 volt range). If you are just reading battery (static) voltage then it sounds as the alternator is not functioning.


'19 CT6, '04 Bravada........but still lusting for that '69 Z-28

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