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#4669218 - 02/17/18 11:20 PM 1999 Sebring convertible 2.5 battery not charging
SillyPopPop Offline

Registered: 02/17/18
Posts: 2
Loc: Alabama
The battery light goes off when the car is started, but goes back on in a few seconds, and remains on. I have replaced the alternator (although the old one tested good), and replaced the battery. The problem persists, and the battery goes dead after driving the car maybe 50 miles. Does anyone have a solution?

#4669222 - 02/17/18 11:30 PM Re: 1999 Sebring convertible 2.5 battery not charging [Re: SillyPopPop]
zrxkawboy Offline

Registered: 11/30/04
Posts: 1761
Loc: SD
What is the voltage at the battery when the engine is running? I'm not sure, but that car may have the regulator built into the ECM.
"Think of all the Ford owners who will someday want an automobile." John Dodge

#4669238 - 02/18/18 12:13 AM Re: 1999 Sebring convertible 2.5 battery not charging [Re: zrxkawboy]
SillyPopPop Offline

Registered: 02/17/18
Posts: 2
Loc: Alabama
With the engine running, battery voltage is about 12. The voltage regulator is internal to the alternator, as far as I know,

Edited by SillyPopPop (02/18/18 12:14 AM)
Edit Reason: Add comment.

#4669247 - 02/18/18 01:16 AM Re: 1999 Sebring convertible 2.5 battery not charging [Re: SillyPopPop]
Dylan1303 Online   content

Registered: 10/14/15
Posts: 180
Loc: Washington
Belt slipping?
12 chevy cruze 1.4t 6spd penz euro 0w40
09 ford fusion 2.3l auto royal purple 5w20

#4669283 - 02/18/18 05:28 AM Re: 1999 Sebring convertible 2.5 battery not charging [Re: SillyPopPop]
Lubener Offline

Registered: 01/22/11
Posts: 2576
Loc: N.Ohio
The regulator may be within the processor. You need to do some further diagnostic work in that area and the wiring from it to the alternator.
The "thinking" man's friend.

#4669298 - 02/18/18 06:21 AM Re: 1999 Sebring convertible 2.5 battery not charging [Re: SillyPopPop]
Trav Offline

Registered: 11/20/06
Posts: 18877
Loc: MA,
Measure the voltage at the alternator itself if it has the correct voltage look at the connections especially at the starter motor if there is one, these sometimes rot.
You can run a direct wire of the correct gauge from the alternator to the battery with ring terminals to at least test the system, then you have an idea where to start looking. Do not connect both wires, disconnect the original first.
ASE L1, Master. Deutsch Meisterbrief.

#4669323 - 02/18/18 07:22 AM Re: 1999 Sebring convertible 2.5 battery not charging [Re: SillyPopPop]
Donald Offline

Registered: 03/21/04
Posts: 20456
Loc: Upstate NY
Measure voltage at battery with engine off and engine running. Should be at least 1V higher with engine running.

Have alternator tested at a place that rebuilds alternator and starter. They should have an oscilloscope to see waveform. Ask for their opinion.
2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)

#4669326 - 02/18/18 07:25 AM Re: 1999 Sebring convertible 2.5 battery not charging [Re: SillyPopPop]
eljefino Offline

Registered: 06/15/03
Posts: 32635
Loc: ME
Dodges use external voltage regulators. Yours is inside the computer but you can find instructions online on how to use a $10 external one from a 1970's Dart.

You should have a field wire you can ground... do that and it'll make ~18 volts, proving the alternator works and you have a regulator issue.

#4669423 - 02/18/18 08:46 AM Re: 1999 Sebring convertible 2.5 battery not charging [Re: SillyPopPop]
mene Offline

Registered: 02/18/12
Posts: 214
Loc: winter park, Fl.
OK, you should have a 2.4L not a 2.5L correct me if I'm wrong please (is not relevant all the cars use the same system). The voltage regulator is in fact inside the ECM (engine control module) they are very reliable so I would check wiring/plugs first, it sounds that when it is cold there is contact and when it heats up there isn't, if the light comes on in less than 5 seconds after starts the problem is there all the time, it takes few seconds for the computer to check all systems and take action or not if it takes more than that then check voltage at the battery as soon as the engine starts with the battery charged and before the indicator light goes on if possible, voltage should be between 13.8v and 14.4 or voltage climbing to this range at this time of the year and keep on watching to see if the voltage drops down as soon as the light goes on all this will tell you if it is the voltage control system (field) or if it is the ground/charging wire (high amps). I have in the past unplugged the computer and plugged it back and many gremlins have disappeared (poor contact). If after checking all wires and contacts the problem persists it should be the internal voltage regulator, me personally would connect an external regulator for any Mopar vehicle between 1968 and 1989 (non computer vehicle) but get a "heavy duty" regulator the normal duty will not be able to handle the field in the nippondenso alternator you have, you can even get an adjustable heavy duty regulator and set the voltage to your liking, also try to fit the regulator besides the battery or as close as you can, it has a temperature sensor inside to help with the proper charging of the battery so the closer the better, after that if the indicator light bothers you a resistor can be fitted to the original plug coming from the computer fooling it into believing that it is connected to the alternator it works 2 out of 3 times. Good luck and keep us posted
1984 Dodge Caravan. 461K miles (replaced by the 2000, body rusted badly)
2004 Chrysler Town & Country. 152K miles
2000 dodge caravan 2.4L 277K. miles

#4675365 - 02/23/18 10:53 AM Re: 1999 Sebring convertible 2.5 battery not charging [Re: SillyPopPop]
WyrTwister Offline

Registered: 01/13/13
Posts: 1519
Loc: Texas
i agree , Check voltage at the alternator . Is the belt slipping . Id you need to , run an external charging wire from the alternator to the battery , as has been suggested .

Also , check grounds . Run an external wire for ground , too , if necessary .

Report back what you find .
God bless