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I am having problems with my battery charging in my 1990 cadillac brougham. It has a new altenator when tested in car it says bad voltage regulator but when bench tested it says good. I have replaced the cable from altenator to battery I have replaced the pigtail conector and still getting the same read. There are two wires that come from the pigtail and look like they go to a relay on the firewall. Wanting to know if this my be a possibility and if so if you know what is ran off it?

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This would be the voltage regulator, keeps the voltage at the correct level if this unit is faulty if will think it is fully charged at 13.8 volts where it turns off the charge when it may be thinking at 6 volts it is full

Posted on Nov 25, 2013

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Posted on Jan 02, 2017

johnny5846
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SOURCE: altenator is not charging the battery

sir , the altenator has 3 wires at the connector correct ? a white/red , a green/white and a black , the white/red wire is involved with a 10 amp fuse to do with the charging meter / gauge , the fuse located behind left side of dash .. the green/white wire is is involved with 2 fuses , a 10 amp ECU fuse and a 25 amp Main fuse located at left rear of engine compartment main box , and the black wire is involved with a main 80 amp fuse at the main box also . both of these 2 wires end up at the positive side of the battery , please verify all these fuses are good . if they are indeed good , then open wiring would be next step verify continuity on black and the white/green wires . i would post a link to diagram but autozone repair info site is down at this time . if ya need more help , please ask .

Posted on Jan 05, 2009

  • 20 Answers

SOURCE: 1983 cadillac fleetwood brougham 4.1 liter battery not charging

check the alternator fuse that can be a fuse link by the battery pole,check alternator voltage on the alternator red wire or connector,it should the same as on the battery ,check ground wires for loose intermitent contact

Posted on Aug 16, 2009

  • 733 Answers

SOURCE: replaced alternator on 1985 Ford Bonco 4X4 302

turn your vehicle on, disconnect the battery, both terminals(while truck is still on) if it dies on you, then either the alternator is bad or wiring is wrong. if it stays on, then you may have a bad battery or voltage regulator. Check the voltage on the battery before you turn it on(should be from 11.5v-12v), when you turn it on if the alternator if working properly you should have around 13v-14v.

Posted on Sep 16, 2009

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My 1989 cadillac brougham is not charging alterntor just bin rebuilt can't find problem wot can it be


Can be so many things, special after you changed (rebuilt it) things. Can be a plug, wrongly connected, build in a defective part. A bad dynamo or voltage regulator. Try to find what is working and where the voltage is not coming or to low.
Would be almost impossible for anyone else to diagnose, if a skilled rebuilder can't find what is wrong, when he is working on the car.

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1983 cadillac fleetwood brougham 4.1 liter battery not charging


check the alternator fuse that can be a fuse link by the battery pole,check alternator voltage on the alternator red wire or connector,it should the same as on the battery ,check ground wires for loose intermitent contact

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CHARGING SYSTEM


well for starters your altenator is bad because what it is dolinging is over charging the battery hence why it boiled off the water/acid in the battery. the regulater is intergrated into the altenator. there is not a short because numberone your car would not start and two your battery would explode. i never test a battery or altenator at a store like napa or Oreilly's because they are not mechanics ......they are parts guys. your altenator should charge the battery at no more than 14 volts and the average is 13.5 volts. you need to replace the altenator the reason why you are losing a charge is be cause as the car is running the battery is being discharged because the regulator is defective in the altenator. please rate this thanks

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