Question about 1993 Jeep Grand Cherokee

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Short electrical problem chargeing system will charge sometimes and other times it wont. possible short in wire need a diagram of chargeing system alt is ok good battery when it dont charge the battery drains super quick more than just not charging

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Tour problem is in the voltage regulator inside the alt.
Replace the alt.

Posted on Oct 27, 2008

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Posted on Jan 02, 2017

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Does the ECM control the alternator charging amperage/voltage on a 2004 Suzuki aerio? New alternator only charges @12.5. Won't charge enough to keep ahead of necessary power draw.


Some vehicles are fitted with a smart charging system that is designed to prevent the alternator charging during acceleration to free a few horsepower to help.

My experience of these is very limited but there is an ECU that controls them and the battery, charging or ignition light using information from the engine management system.
The alternator generally has an extra plug with about four or five wires which when disconnected render the alternator a standard machine sensed type.

Japanese vehicles used separate voltage regulators longer than most types. You either need experience or a wiring diagram for good fault diagnosis but mostly it is unnecessary to check the charging current of an alternator which bears little significance unless being tested with a graduated load or adjustable carbon pile.

The current output of a healthy alternator is dependent on the terminal voltage of the battery which in turn is dependent on the electrical load placed upon it. Switching on the lights should lower the voltage and increase the alternator output. If the battery is particularly good the voltage won't fall very much and the current won't increase as much as expected...

Measuring the battery voltage with the engine running at about 2000/2500 rpm is sufficient for most purposes. With nothing switched on and a fully charged battery it should be around 14.5 volts and with everything switched on (lights, HRW, heater fan, etc.) a healthy alternator should continue to maintain a voltage above that of a healthy fully charged battery (13.2 volts).

If the voltage isn't maintained on load the charging system, probably the alternator, is faulty and should be independently tested.

Jan 25, 2017 | Suzuki Cars & Trucks

1 Answer

2006 jeep wont start


You did a good starting of troubleshoot, now you need to find out WHY. There is a wire touching and providing feedback into the Electrical System

Apr 09, 2013 | 2006 Jeep Wrangler

1 Answer

2002 Ford Focus, driving down road, airbag light comes on, dashlights go out, engine runs rough then quits. Restarts, goes one block, quits again.


Symptoms of a charging system problem. The charging system comprises the alternator, battery and associated wiring. If the alternator should fail to produce a sufficient or stable enough voltage for the car's electronic systems - due to a wiring short, faulty voltage regulator, or corroded electrical connector, for example - the car will run off the "reserve" in the battery for a short time until the battery is eventually depleted. (The battery itself could also contribute to the problem if it has a faulty cell or for some reason is causing the alternator to put out an excessively high voltage in an attempt to compensate.)

So a couple of quick checks: Measure the battery voltage with the car off. Yours sounds like it will be dead; the clicking while attempting to start is the starter relay not getting enough juice. Then the question becomes: Is the battery dead because of age (fails to hold a charge) or because the alternator isn't charging it? To answer this question, measure the voltage at the battery with the car running. (Jump it or substitute a known good 12V battery.) You should see 14+V. If you only see 12V or less, you're seeing only the current battery charge without any contribution from the alt.

Finally, don't assume because the alt isn't putting out anything the alt is at fault. The wiring harness and electrical connector to the back of the alt should be thoroughly examined. (The wiring connector is a known failure point on early models.) The wiring harness should obviously show no signs of burning, melting or chafing and the battery terminals should be corrosion free and tight. If the harness checks out, remove the alt and have it bench tested. Rebuilding usually gives better long term reliability than chain store bought reman units, I'm told.

Long story short, I suspect the voltage regulator in your alternator failed, the battery gave it's all trying to keep your car running, finally gave up and now you have a dead alt and a dead battery. Don't just install a new battery without doing the alternator voltage output tests.

If you're really lucky it could be as simple as loose or corroded battery terminals.

Dec 31, 2012 | 2002 Ford Focus

1 Answer

Battery light was flashing on dash,alternator was charging intermitently,had alternator tested on car and told diodes were bad.went to get it rebuilt and told its good.I need suggestions on what to check...


There isn't much to the charging system on any vehicle. The belt spins the alt copper binding and creates eletrical current. That current goes directly back to the battery. The other wire goes to the gauge in the dash. I would replace the alt. If you said it was intermittent and it tested good at the rebuild shop who is to say that wasn't one of it good times? Easy way to find out how good it is. While the car is running unhook the possitve terminal from the battery. If its good the car will stay running. If it isn't the car wont.

Mar 08, 2011 | 1999 Mercury Cougar

1 Answer

Electrical short or loose connection


did this problem start after the new alternator or is this the reason you replaced the alternator? sounds like a loose wire on the alternator or the battery post. make sure the battery terminals are clean from corrosion. if there is a hot spot on the wires or connectors that is a good sign that is a loose connection.

Apr 25, 2010 | 1997 Chrysler Sebring

1 Answer

Im having trouble starting my jeep when it starts i have to give a little starter fluid and it will run fine but acts like it starts loosing power truck eventually dies and when i try to start it turns...


I'm sending you a wiring diagram so you can get an idea of what your wiring routing is like. What I think you have is a regulator not inside the alternator but inside the computer. Therefore replacing the alternator will not help.
Charge the battery and have it load tested, then check the charging system. You should have at least 13.5 volts running. if not, check the wire between the battery and the alt for power. The computer sends a ground signal to the alternator through the black and white wire (check that on diagram...I'm doing this from memory) If you ground that wire the alt should charge the battery. DO NOT leave that wire grounded as a fix or it will boil all the water from the battery and turn it into a brick! If you find that works, and the wiring is intact, replace the computer. Usually you can find one at a reasonable price in a scrapyard. find the diagram at: http://www.scribd.com/doc/18999822
/Jeep-Wiring-2
Good luck!

Mar 09, 2010 | 1994 Jeep Grand Cherokee

1 Answer

Charging system error


Have the fusable link checked. It's a short insulated wire integral with the main wire harness. ( if it is equipped with one).

Jun 27, 2009 | 1983 Lincoln Continental

1 Answer

Entire 1996 blazer electrical dies when starter solenoid engaged


if voltage reulator on alt. does not stop current after battery is charged it will over charge battery abd can drain cell from boiling electrolite out.check 4 bulged battery case(swelling) indication of overchaeging.the start problem could be your starter wires connection.remove starter wires clean contacts and torque respectively.dont forget the ground to motor.sounds like a loose or corroded contact somewhere.

May 31, 2009 | 1996 Chevrolet Blazer

2 Answers

1988 chevy suburban charging system problem alternator wont charge new alternator new ignition switch good battery good belt removed old alarm system removed and replaced fusible links no shorts in system...


First check alt At The Back of Alt Big Red Wire Were hooks to Post (stud) Do you have voltage ?? How Much??
What Voltage do you have at same Place with Engine Running ??
Now At wires Were they plug into Alt ,Top. Wires in White Plastic Clip, Do You Have Powe With Key On ?? How Much Voltage??
Jump across the 2 in the clip (with Engine Running)ONLY TEMPORARY!! Do You Have Voltage at Battery ?? How Much??
If Over 13volts With Clip On (Jumped) You Need A Internal Voltage Regulator ..
Is Batt Light On on Dash ??? Theres A Lot Of Testing You Can Do !!! And I will Need More Infomation to Keep Going ... These are just some Possible Problems No Way In Depth ...
Could Be a Number of things Or May be Just as Simple As a Blown Fuse, Dirty Batt Cables ETC etc etc I Hope It Puts You On The Right track !!!!!!!!!!

Dec 02, 2008 | 1988 Chevrolet Suburban

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