Question about 1995 GMC Suburban

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My battery is fully charged, the alternator is new. if i disconect the battery the truck will shut down....What do i need to check for???

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First off, never disconnect battery when vehicle is running. It could stress out the alternator and blow the diodes. Now you need to put a volt meter on the battery while the vehicle is running to see if the alternator is putting out 14 volts. If its putting out 12 or less, you have likely blown the alternator. Remove alternator and have tested free at Orielys or napa. I dont trust autozone.

Posted on Oct 09, 2010

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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

2 Answers

Having cranking issues and battery isnt charging as suppose to 2004 f250 diesel crew cab


need more info year make model clean your terminals check the output voltage on your alt with a multimeter 12 plus is good if you have a maint free batt look in the eye and check the color or take it to the auto parts store theyll check it for free


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Apr 12, 2016 | Cars & Trucks

1 Answer

New batteries keep losing their charge, also when running sounds like it loses all power then in a split second it stays running


sounds like an over draw on system
computers need min 10.5 volts to stay alive (working) other wise they shut down
i would start by charging batteries fully and disconect from vehicle for 24 hr
then re check before hooking up if they staied charged batteries are good
then hook up bateries negatives then hook up a voltage meter to performed a parasedict
test other word in series to positive cable on wire and other to battery positive if draw is high
on meter start removing fuses on at a time until voltage on meter drops
you have know located source of draw that is killing batteries know diag that problem
ex . under hood light staies on........glove box stays on.......aftermarket stuff inproperly conected
good luck

Feb 01, 2011 | 2004 Ford F350

1 Answer

I just brought a new alternator for my car today. you know how you have to take the positive post off the battery and test the alternator it shut down completely


A ford has to have a fully charged battery to make the alternator charge. You can damage the new alt. that way. Take it to a Interstate battery place or equal and get them the test battery and alt. They know what they are doing as the parts house guys don't.

Feb 01, 2011 | 1991 Ford LTD Crown Victoria

1 Answer

The car is not holdong a charge. I replaced the Battery about a year ago. Today I replaced the alternator. I used jumper cables it ran for about 20 minutes and then died again. All the wires look good. Any...


FIRST, YOU MAKE SURE THE BATTERY IS FULLY CHARGED.. A GOOD BATTERY WILL GO FOR 12 HOURS EVEN IF THE ALTERNATOR IS NOT WORKING.. SECOND YOU TURN THE CAR ON.. ONCE THE CAR IS ON. YOU DISCONECT THE BATTERY,, IF THE ALTERNATOR IS GOOD , THE CAR SHOULD REMAIN ON WITHOUT A BATTERY.. IF IT SHUTS DOWN , YOU HAVE A BAD ALTERNATOR OR THE WIRING IS WRONG ONE OF THE TWO.. SHORTS ON YOUR WIRING CAN CAUSE THE BATTERY TO LOOSE POWER.. BUT NOT THAT FAST. BECAUSE IF THE SHORT WAS TO SERIOUS.. YOUR WIRING WOULD BE BURNED.. COMPLETELY..
IF THE ALTERNATOR IS OKAY,, REPLACE YOUR BATTERY,, MOST OF THE TIME BATTERIES GO BAD EASY WITH ANY LITTLE PROBLEM THE CELLS BURNOUT AND THEY DONT HOLD A CHARGE EVEN IF FULLY CHARGED THEY WILL LOOSE POWER IMMEDIATELY .. I THINK THAT IS YOUR PROBLEM.. SINCE IT ONLY LASTED LIKE 20 MINUTES.

Dec 14, 2010 | 1996 Isuzu Rodeo

1 Answer

My spouse had to get out 1996 ford explorer boosted while i was at work,so that evening i tested the battery it had a charge of 12.4 and is about 5 years old so i bought a new battery ,i put the new...


A new battery should have approx 12.62 fully charged
It could be slightly more
If you ever see 13 volts, on an old battery, it is gone

You need a min of 12.5, to do any testing of your vehicle, or you charge it
It should hold 12.5 or more for 3 or 4 weeks,then charge, if you let the truck sit
unused.

Dec 01, 2010 | Ford Explorer Cars & Trucks

3 Answers

Battery drain in 2days


Well there either something staying on and draining the batteries or your alternator isnt charging the batteries.

Sep 07, 2009 | 2003 GMC Sierra 2500HD

3 Answers

Not charging


Your alternator is faulty.

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