Question about 1997 Dodge Caravan

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My battery lite comes on i can hit alt. andit goes off but comes on again later til i hit it again

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Replace the alternator before it leaves you stranded.Good luck.

Posted on Feb 02, 2010

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1 Answer

Battery light alternator


The Charge lamp comes on with the Alternator fails to keep battery charge going. (lots of way to fail, and ALT Is 100% good) it's a system. each part of it must be good, end to end.
so...
i put my voltmeter across battery, i start car, i see 13.3 to 15vdc, alt is good.
no? , i see now, 12.2v. ALt is dead, (i didnt say bad) and battery is sightly discharged, 12.6v is charged. (key off, rested voltage)
This 12v tells me the ALT is shut down. only why is the question.

how can any charge system fail,
bad battery tops the list here, they LOVE to fail.
1: belt slips.
2: belt missing
3: bad alt.
4: bad wires to ALT . (corrosion on any wire or lug)
5: fuses blown , any listed below.:
your alt is not an ECU controlled, alt ,its 100% self contained

did you ever remove the ALT and blow the 100 amp fuseable link
the first step of any alt pul, is the pull the NEG, battery lug or BOOM.

im logged in to alldata.com so can you.

and what do i see.
a 5 wire ALT. one is the frame ground, so it must not be rusty or..... it fails. frame to engine block. no rust here.

wire L , yellow.goes to dash LEDs (alt failure idiot lamps) (this works)
wire. S white goes to ALT 5a fuse, is it blown?
wire :B B/G color, goes to the 100 amp link fuse. (blown>?)
wire IG Red-white, goes to a fuse marked 10A gauge.

i think the IG wire is the voltage sense wire.
no sense, no charge. I think the whole I/P dash cluster goes dead when this fuse blows.

The S wire is the boot strap voltage sense, it wakes up the regulator .
if open , the reg stays asleep, as does ALT.
Alternators can not self start, the regulator has boot strap device
that cures that. called self excitation. so this wire is critical.
All wires except the L wire is critical. in this case.

the B wire is the big wire, it charges the battery . 50amps or more..

any of the 5 paths open , kills the ALT dead.
The REG inside the ALT can also shut it down.
eg: battery bad, with huge cell resistances. total.
eg: overvoltge for any reasons. including attempts top run car with no battery, (dont ask)
eg: over current (battery cells 1 to 6 shorted) or 25 KC lamps added.
eg: over temperature shut down.

that is about it.







Dec 31, 2013 | 2003 Toyota Matrix

2 Answers

2000 vw jetta alternator won't charge


the alternator gets power on big wire battery voltage the wire runs to starter, fuse box .alternator fuse goes to automatic shut down relay to relay control in ecm/pcm the field wire comes from ecm /pcm to alt.other field goes back to automatic shut down relay back to charge battery . if not charging at alt. try new alt. and retest.

Aug 05, 2012 | Cars & Trucks

1 Answer

1997 Dodge Ram 1500 5.9l 4x4 club cab. Gen light comes on. I tap my alt and it charges normal 14v after 10 min drive it stops charging and drops to 10v. had alt tested at autozone and cheakers both te


replace your altenator . the brushings are most likely bad and only making contact after you strick the alt. housing. it makes the brushing drop down to the armature.

Feb 29, 2012 | Cars & Trucks

2 Answers

I have 2002 saturn L will not hold charge . Had battery checked it was fine . Replaced alternater and still not fixed. Will start when jumped off n run til battery is drained then everything goes out...


OK Check the voltage coming out of the alternator while it's running you should have at least 13-14.7 volts and no less than 13 volts and no more than 15 volts.Also check your alternator belt for slipage.

Jan 20, 2012 | 2002 Saturn L-Series

1 Answer

Ok I have a 89 chevy 1500, it start, runs, and go. When I hit the blinker signal, the battery volts drop, and when I come off the brakes and accelerate, the brake and battery light come on and 5 seconds...


It's either your battery or alternator have them tested. If your alternator is bad it wont charge the battery. If the battery is bad it won't hold the charge from the alternator. Good luck!

Jul 04, 2011 | 1989 Chevrolet K1500

2 Answers

Charges ok, battery was replaced, connections cleaned and painted,ran fine for almost three months, then battery went flat again, checked altenator clleaned and greased connections, van ran fine for any...


I would check and clean any wire and connection between the alt and the battery and all grounds. Also check and see if charging voltage is the same at the battery post as it is at the lug on the alt.

Feb 20, 2011 | Chevrolet Venture Cars & Trucks

1 Answer

Battery light on; then the instrument cluster goes


may be a bad alt check voltage while running should be about 14 volts

Jan 20, 2010 | 2003 Ford Focus

3 Answers

Battery light comes on then goes off then comes back on put new battery in and altinator


You need to connect a meter across the battery terminals to determine whether the battery is being charged by the alternator. Compare the voltage at rest to that obtained when the engine is running. It should be about 12 volts at rest and then rise to approximately 14 volts. The voltage regulator (which controls how much voltage is being produced by the alternator and operates the charge lamp on the dashboard) on some vehicles is separate to the alternator. If the voltage is rising to within specifications as previously mentioned, the wiring to the lamp may be being earthed somewhere along it`s run to the alternator/regulator. Ian

Jul 18, 2009 | 2000 Ford Focus

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