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I had this problem with my 1989 caprice. The voltage was so high it was blowing the headlight bulbs. I changed the alternator but the problem did not go away. Turns out the alternator senses system voltage with a separate wire going from the starter to the alternator. There is an inline connection on this wire about 2 inches from the starter. This connector was corroded on the inside creating a high resistance. I replaced the connector and the problem went away. You can buy there connectors at any auto parts store for a few bucks. You may need a special tool to strip the wire and crimp the connector. Should not cost more than $20. Check all the connectors on the wires going to the starter. Give them a good pull to see if they are good on the inside. This was 15 years ago and I don't remember the color of the wire.
What else can I help you with?
Why is your 1989 Chevy Caprice over charging?
Defective voltage regulator. It may be built into the alternator.
Where is the voltage regulator on a 1991 Chevrolet caprice?
Integrated into the alternator.
Is there an alternator relay on a 1990 Chevy Caprice?
no there is not.
What cause an Alternator to overcharge?
Bad regulator. they are internal and no one repairs you just have to replace.
How much you does a new alternator for 1989 caprice cost?
http://www.autozone.com/selectedZip,19142/initialAction,partTypeResultSet/initialN,16400086/initialNtt,/initialNo,/shopping/selectZip.htm
How long is a 1989 Chevy Caprice?
The 1989 Chevy Caprice was 212.2 inches long (5,390 mm).
Can you fit a 1986 caprice driver door on a 1989 caprice?
Yes
Does a 1986 caprice driver door fit on a 1989 caprice?
Yes
Is the transmission from a 1991 caprice the same as a 1989 caprice transmission?
Yes
Will a universal bolt pattern for a 1989 caprice fit a 1992 caprice?
yes it will
Can a 1977 Chevy Caprice radio bezel fit in a 1989 Chevy Caprice?
No
When was Daniel Caprice born?
Daniel Caprice was born on 1989-10-20.
