Question about 2003 Cadillac Escalade

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Gone thru 3 alternaters in 5 months whats up

I just put on a new alternator on #3 in 5 months. each time I have the none charging old alt. checked it shows to be good- now this new one is not charging from the get go

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  • Cadillac Master
  • 21,873 Answers

If the alternator passes the bench test but is not charging on the truck, you have a problem in the wiring between the alternator and the battery, or the alternator and the key switch.

Posted on Dec 10, 2012

Who is replacing all these alternators?

Are they New GM pieces or rebuilts of
questionable origin?

As they were installed- did they produce the correct
voltage,current under a load test & have no diode
leakage.

If they never turned on the regulator-- why was that not
figured out?

Posted on Dec 10, 2012

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

localwonder
  • 6784 Answers

SOURCE: alternator not powering up at all time

I would take it back and tell the shop to test the diodes. these vital parts are very important and, some shops look over them like they don't matter. From your description on how it is charging, i can safely say the diodes are bad.

Posted on Mar 08, 2009

csmock132
  • 4669 Answers

SOURCE: new alternator and new battery but the battery is not holding a charge and I had the alternator tested and the alternator is good.

You need to take it somewhere that can do a parasitic draw test. Something in the car is drawing power from the battery with the key off. You can do this yourself if you own an ammeter. If you do, let me know and I can walk you through the test.

Posted on Jun 02, 2009

  • 60 Answers

SOURCE: installed new alternator and car battery still will not charge.

did you unhook the battery prior to installing the alternator

Posted on Jul 12, 2009

  • 14036 Answers

SOURCE: I had a used motor

CHECK POSITIVE BATTERY FEED CABLE TO ALTERNATOR AND CHECK ALTERNATOR FIELD WIRING THEY ARE CLOSE TO THE ENGINE BODY. GO TO AUTO PARTS STORE GET SOME FLEXIBLE CONDUCT PLACE ALTERNATOR WIRES IN IT AND REROUTE WIRES THEY COULD BE RUBBING INTO BODY CAUSING SHORT BLOWING OUT ALTERNATOR.THE CADILLAC 4.6L AND 4.9L ENGINES THE ALTERNATOR IN A TIGHT SPOT CLOSE TO THE ENGINE WHERE THE ALTERNATOR WIRES CAN RUB BODY SHORT OUT.CHECK WIRES AROUND ALTERNATOR CAREFULLY.

Posted on Aug 06, 2010

  • 4044 Answers

SOURCE: 95 cadillac seville alternator wont charge...

This indicates a short on the main wires from the alternator. Probably going to the battery or the wrong size battery. I assume you don't believe it is charging because the battery keeps going dead. This is most likely a problem with a short on a wiring harness. While the vehicle is running check the voltage at the battery. If you aren't getting at between 14 and 18 volts while the vehicle is running you have a short between the alternator and the battery on the harness. if you have that voltage then the problem is a short draining the battery.

Posted on Mar 02, 2011

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1 Answer

Overchanging alternater (ECU?)


The ECU has no control on the voltage. Does your vehicle have a separate voltage regulator? If so that's your fault. A lot of alternators have the regulator built into them. The alternator needs to be put on a test rig away from the vehicle and the output tested, this will eliminate the vehicle, You could disconnect the wiring to the alternator, run three fly leads to the alternator and to a separate battery and run the engine and test the voltage on the spare battery. Wire 1: Battery neg to case of alternator Wire 2: Battery pos to + terminal on alt (the thick wire) Wire 3: Battery pos through a 5 watt bulb to the ind terminal (ignition light) 17 volt will blow another battery for sure.

Jan 07, 2014 | 2002 Hyundai Elantra GLS

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Charging system voltage low


there are only 3 parts. but the causes are 25 or more.
1: belt missing slipping,
2: engine rpm below 800 RPM (lots of ways ,ask )
3: ALT had.
4: wiring to ALT bad.
5: bad battery or its connections, (wires)
6: bad fuse. see fuse link a11? on fFM page 20?
7: car is PCM alt controlled, it can be bad too. see 2 field wires on ALT and PCM on page 20? below?
8: battery temp sensor bad. making PCM think battery overheats.
the fSM covers all tests above.

pick car here, then pick charging.
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the see wiring diagrams at end and chapter 20 inside, charge.
pdf page 118 for gas engine, if diesel next few.

Jan 07, 2014 | 1998 Jeep Cherokee

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The battery kept dying. Buying a new one did not work. Now it will not start after being charged then turned off. Could it be the alternater? Another question, can I put one in my self?


Yes, sounds like alternater.Most cars run off battery and the alternater replaces the voltage your using.If alternater is not putting out the car will kill battery very quickly.If you have some basic tools you can change this out yourself.If you have a digital voltmeter to verify the alt is putting out you can charge battery read battery cold,start car and read battery voltage with car running should be between 13.2 to 14.5 volts DC.If battery is reading 12 volts and dropping rapidly,your alt is shot.

Feb 06, 2011 | 1994 Chevrolet Camaro

1 Answer

ELECTRICAL PROBLEM


May I can put a nail in this one for you.The problem is your alternator. The proper charge rate is 13.6 to 14.2v Now get this. The higher the voltage, the lower the amps.Voltage @ the 14.2 end is moving the minimum amps. @ 15 v there os no charging happenning. Go to the other end and you'll find at 12v the alternator is puring the coals to the battery Alt @ max output. The difference between 12 and 13 / 14 and 15 is the is like a buffer. If the alt charges @ less than 13v for any length of time, It goes poof because of excessive heat.which is an indicator the battery is possibly ready to go poof also. Alt. function as a source of maintenance charging when deman is low and a compensator when demand goes up. That is why a low cranking amp battery is for lawnmowers and people that like buying batts and alts.Now, solution! Have your battery load tested. Chances are real good that it is not up to par. Hence, overworked alternator. If so, replace it. 650 to 850 cold crank amps rating . (cca ) Then have your alt tested output checked if you you end up with a new batt. If your alt puts oout in the given range, which should be around but not below 13v) After starting, it will charge heavy to make up for the cracking, but should get up around 13.6v within 15 seconds. Alts charge at all speeds, unlike generators of old which needed speed (rpms) to put out power. Alts do all the thinking and have internal regulators. Well anyway, You didn't ask for a course in Automotive electrical just a course of action. Remember, Battery first ten alt. Good luck. Any autozone or checker parts store can do all that checking for you. -Ned-

Sep 04, 2009 | Mazda MX Cars & Trucks

2 Answers

Alternater trouble Mitsubishi Montero Sport 2003


I have had the exact problem. I've changed altenator 3 times also and it has the same leak, but I've changed altenator an batterys over 2 year span. It just happend to me today after not driving it for 5 months. It's been in storage while I was away. Drive it fine for 2 days but today the radio kept shutting off and finally the car died right in the middle of the road. Bought a new battery because I had a warranty on last battery, but bought it just to get it home and in the driveway. Did you ever find out what was wrong with it?

Jul 14, 2009 | 2001 Mitsubishi Montero Sport 4WD

1 Answer

1996 izuzu roeo electrical


check alternator:

There are 2 connectors on the alternater. The round one has 3 wires. If there is no voltage on the green wire when the engine is running the alternator is bad. I'm not sure what fails internally but the alternator can put out fine charging voltage on the main black lead and not have voltage on that green wire. That wire is a trigger for the fuel pump relay. Voltage goes to the main power relay then to idiot lights in the dash then back to trigger the fuel pump relay. Along the way it goes in and out of the oil pressure switch(sender at the back bottom of passenger side of block with 2 yellow wires). This switch cuts voltage to fuel pump if no oil pressure. The green wire from alt is a safety in case of collision ect. Engine not running> no alt voltage on that wire>no fuel pump pressure>no fire. If this wire is bad it will not show up on the standard auto store test. And is a common failure. I had an brand new Isuzu rebuilt OEM alternator that was bad like this.

Dec 06, 2008 | 1995 Isuzu Rodeo

5 Answers

1997 isuzu rodeo


start the car,, leave the car on and disconect the battery if the car still on the alt is good but if the car turn off Replace the alt

Sep 06, 2008 | 1996 Isuzu Rodeo

3 Answers

Jag xj8 3.2 v8 charge light staying on


try putting your vehicle on a diagnostic check although you have changed the alternator the ECU ( car computer ) may still think that the alternator is still faulty a diagnostic check will cure your problem by clearing the fault codes on your ECU

dean

Jul 29, 2008 | 1998 Jaguar XJ8L

4 Answers

BATTERY LIGHT STAYS ON. NEW BATTERY. ALTERNATOR CHARGING OK


Mazda Mpv 2000 I also have the same problem, the alternater is testing good- 14.12Amp, so what is the problem the battery light will not go off.

Jul 15, 2008 | Mazda Tribute Cars & Trucks

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