Question about 2000 Cadillac Catera

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Need to know how to change an external voltage regulator

Battery goes dead after sitting

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If it only goes dead while sitting, your regulator isn't the issue. I'd hook up a trickle charger, or have someone start it for several minutes a week with no accessories (fan, A/C, lights) running.

Posted on Mar 27, 2014

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2 Answers

I have 2003 Saturn Ion and I have bought a new


test the battery voltage while the engine is running, (you'll have to jump it again)
if you know the battery, voltage regulator and alternator are good, you may have to check all the fuse-able links on the car, all the vehicle grounds, and the fuses and relays.
if you put your battery on charge until it is fully charged and let the car sit over night and it is dead, either the battery is internally shorted or the vehicle is drawing far to much current and each circuit tested to find the short.

Oct 01, 2014 | 2003 Saturn ION

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86 chevy k10 battery dies when it sits for more than 8 hours, why?


sounds like the voltage regulator or altanator is bad in some of those trucks the voltage regulator is extournal i would reacomend replacing them both

May 07, 2012 | Cars & Trucks

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My 1990 Ford Taurus has a battery drain problem. I'm not sure what is draining it but I just bought a new alt. and new battery and the next day the new battery was dead and I had to jump it. Could it be...


I fixed the same problem in my 1990 Ford Taurus, it turned out to be the external voltage regulator.
I determine that my external voltage regulator had failed by testing the charging voltage across the battery while the car was idling. It should be a maximum of 15V for most batteries; mine was at 17.8V which means the voltage regulator was not regulating the voltage sent to the battery. Also when the car was parked it pulled a constant 3.0 amps (which drained my battery overnight). I was able to test for the amperage draw by just disconnecting the voltage regulator and hooking up my multimeter in series with the battery, the draw was gone.
I replaced the voltage regulator, which is a very easy fix, and I was good to go again. :)
Hope this helps someone too.

Feb 02, 2011 | 1990 Ford Taurus

1 Answer

I seem to have a charging of the battery problem. I would get 14 volts to my battery from my alternator and then 6 volts, i changed m alternator and things were going great, no problems. Now it is acting...


Hi,
If you were originally having a wild fluctuation in measurement at the battery the voltage regulator would have been shot. I'm not sure of what the condition was of the original alternator. But I would definitely have changed the voltage regulator. A bad regulator can ruin a battery and all sorts of other things. If you are now getting wild variations in voltage
1st Purchase and install a new voltage regulator. (probably about $20.00 these days.
Then check your new battery by doing the following:
1 Disconnect it from the truck's electrical system.
2 Charge it up using another vehicle and jumpers.
3 After disconnecting the battery from the jumpers, let it sit for a few minutes.
4 Check the voltage. If it is below 12 volts, the battery is shot. Replace it under warranty.
5 When you get the new battery, Install it in the truck and start it up. Then measure the voltages coming into the battery from the alternator and the new voltage regulator.
If all is well, your done.
If not. Pull the alternator and replace that.
Hope this helps,
Good Luck,
Mark

Jan 05, 2011 | 1988 Dodge Ram 50

1 Answer

Replaced the alternator and voltage regulator, battery goes dead when lights are on at night. The fan belt is new and properly tightened. Any suggestions


Suggest that you recheck the connection on the voltage regulator!

Next, start the engine and place a good voltmeter across the battery terminals and read the voltage at idle with nothing on.
Next, turn on the headlights and read the voltage. If it drops more than 2 tenths of a volt (goes from 14.2 to less than 14 volts) the regulator is bad. If the voltage is always less than 13.5 with the engine running - chances are that you got a bad generator!!

Let us know!!

Oct 10, 2009 | 1966 Ford Mustang

2 Answers

Battery goes dead


Sounds like a short in your starter.Get it checked.

May 20, 2009 | 2000 Kia Sephia

1 Answer

Good alternator & battery, but battery goes dead just sitting


The regulator could be sticking in the alternator. Unplug the alternator and see if the battery goes dead. I replaced an alternator once and the new regulator was bad.

Feb 15, 2009 | 1991 Pontiac Grand Am

2 Answers

1986 dodge daytona voltage problem


Have you actually tested voltage output with multimeter, as this all happens ? May need new alternator to start with, it has voltage regulator built in I believe.

Nov 23, 2008 | 1987 Dodge Daytona

1 Answer

When sitting over night the battery goes dead, also while driving the gauges drop off and then all the lights come on as if i just started the car


you have a weak alternator it needs replaced .... unless it has an external regulator then that could just be shorted out 

Jul 15, 2008 | 2001 Chevrolet Monte Carlo

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