Question about 1999 Chrysler Concorde

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1999 chrysler concorde. 131K mi. 3.2L Battery is new, alternator checks OK. Bypassed fusible link to rule out that possibility Will jump start and run normally for 15 min. Then dash and interior lights flash off and on and battery light lights up on dash. Car keeps running normally, but will not start again without a jump. Even when new battery was installed the first time, after 20 min of running it needed a jump start again. is this a computer issue?

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Hello Kurtzuba.

Actually, although rare, this could be a computer issue.
The voltage regulator is built into the computer on your Concorde and may not be completing the circuit.

I'm not sure how you verified the alternator is good other than you removed it and had it tested.

To verify the problem is in the computer, find the orange/dark green wire that supplies power to the alternator.
This is fused power to the field. Verify it has 12.5 volts positive. If not, that will need to be repaired.

If it is OK, then find the dark green wire that also hooks to the alternator.
This wire leads to the computer which controls the amount of ground to regulate the amount of output from the alternator stator.
Attach a wire with an alligator clip to the dark green wire terminal on the alternator.
Attach a voltmeter to the battery.
Start the car and touch the other end of the attached wire for a few seconds (no more than a minute) to the NEGATIVE battery terminal.
If the alternator begins to charge you will need to verify the green wire is good to the computer.
If OK, replace the computer.

If you need more assistance with this issue, let me know here.
Thank you for using FixYa.
KL

Posted on Mar 28, 2011

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