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86 suburban 350. Volt gauge shows just over q3 while driving but at idle falls to 9. Alternator? Battery?

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  • Cars & Trucks Master
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Eighter you have A problem with the battery or the connections to it or its the alternator .
Ckeck the belts and tenisinoer if you have this on a 86 .Turn on the head lights do they look yellow and dim .
Do you owen a volt meter if so set it on a 20 volt DC scale and with the vehicle running go B to B and R to R on the battery terminals you should at least 13.5 volts to 16 volts if you have this then the ALT is working and the problem is something else .
It is an older vehicle but in a lot of ways much easyer and cheaper to fix then these new HI TECH systems ware you hit a pot hole and the computer and all of the sensors malfuntion at the same time .
Hope this helps good luck

Posted on Apr 24, 2015

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SOURCE: battery test proper voltage, new alternator test

If you test battery with a load test it will probably fail. Battery is bad. Also have alternator tested. Go to any parts store, even walmart they all test for free. I would put my money on bad battery. Cells getting weak.

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Most likely it's the oil sending sensor, located beside the oil filter. You can change it, just be sure to have old newspaper or rags laying around the area where you will work, because a little oil will be lost. The part isn't expensive, for mine on a Ford Expedition was around $35 and took 5 minutes to change. Just un-plug the connector going to the sensor, and a larger wrench will be needed, large (7/8, 15/16) somewhere in that range of size.

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SOURCE: low oil pressure 93 GMC P/U w/350 motor w/205,000 miles gauge

While engine is running, open the cover where you add oil to engine and see if you see a good flow of oil, if good flow, could be as easy as replacing oil sending sensor. got to realize that if poor maintenance history your engine may not be building enough pressure at iddle to move your hydraulic operated valves, only when you rev it up it will pump enough to run smooth. if running engine too long, you may cause more damage to other engine components such as crankshaft and cam shaft bearings. if you can spare a few bucks, have a good mechanic check your oil pressure with a mechanical gauge. another cheap option is to replace oil pump. last resort if you love your truck as much as we do,replace engine or rebuild it. At 205,000 this is a normal symptom, other than timing chain problems, most engines don't make it that far. hope this helps!

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altenatorrrr

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I have a 2001 suburban when i come to a stop my volt meter goes low and my ac blows hot air, i have a new battery what could it be.


Take it to an Autozone, or similar, and have the alternator tested (they can do it with the alternator in the car).

Something to consider, when running air and other accessories, it's pretty common for the voltage to drop slightly when idling. Just have it tested for piece of mind.

Jul 10, 2012 | 2001 Chevrolet Suburban

1 Answer

How do I replace the serpentine belt on a 1999 Kia Sephia?


1.8L Engine
  1. Using a belt tension gauge, measure the drive belt tension and compare with the following specifications:
    1. Alternator belt (new): 86-103 lbs. (383-461 N)
    2. Alternator belt (used): 68-86 lbs. (304-383 N)
    3. A/C compressor and power steering pump belt (new): 110-132 lbs (491-589 N)
    4. A/C compressor and power steering pump belt (used): 95-110 lbs. (422-491 N)

      zjlimited_1999.jpg
      Fig. Using a tension gauge to measure the alternator belt tension - 1.8L engines (click HERE for zoom)


  2. Using the deflection method, apply moderate pressure (about 22 lbs) halfway between the pulleys, and compare with the following specifications.
    1. Alternator belt (new): 0.31-0.35 in. (8-9mm)
    2. Alternator belt (used): 0.35-0.39 in. (9-10mm)
    3. A/C compressor and power steering pump belt (new): 0.31-0.35 in. (8-9mm)
    4. A/C compressor and power steering pump belt (used): 0.35-0.39 in. (9-10mm)
  3. If the specifications fall outside the ranges given, adjust the belt as follows:
    1. Loosen the alternator mounting bolt and adjusting bolt.
    2. Adjust the alternator to get the specified belt deflection.
    3. Tighten the bolts, then recheck the tension.

      zjlimited_2000.jpg
      Fig. Adjusting the alternator belt-1.8L engines

Hope helps.

Oct 09, 2011 | 1999 Kia Sephia

1 Answer

How do I replace the serpentine belt?


1.8L Engine
  1. Using a belt tension gauge, measure the drive belt tension and compare with the following specifications:
    1. Alternator belt (new): 86-103 lbs. (383-461 N)
    2. Alternator belt (used): 68-86 lbs. (304-383 N)
    3. A/C compressor and power steering pump belt (new): 110-132 lbs (491-589 N)
    4. A/C compressor and power steering pump belt (used): 95-110 lbs. (422-491 N)

      zjlimited_1999.jpg

      Fig. Using a tension gauge to measure the alternator belt tension - 1.8L engines (click image for zoom)


  2. Using the deflection method, apply moderate pressure (about 22 lbs) halfway between the pulleys, and compare with the following specifications.
    1. Alternator belt (new): 0.31-0.35 in. (8-9mm)
    2. Alternator belt (used): 0.35-0.39 in. (9-10mm)
    3. A/C compressor and power steering pump belt (new): 0.31-0.35 in. (8-9mm)
    4. A/C compressor and power steering pump belt (used): 0.35-0.39 in. (9-10mm)
  3. If the specifications fall outside the ranges given, adjust the belt as follows:
    1. Loosen the alternator mounting bolt and adjusting bolt.
    2. Adjust the alternator to get the specified belt deflection.
    3. Tighten the bolts, then recheck the tension.

      zjlimited_2000.jpg

      Fig. Adjusting the alternator belt-1.8L engines


Hope helps.

Oct 09, 2011 | 1999 Kia Sephia

1 Answer

Suburban 1996 4x4 2500 7.4 litter my check gauge light comes on after about 1-5 minutes of driving. the check indicator also pops up on the computer dash at same time . the batter voltage meter goes...


SOUND LIKE ALTERNATOR NOT CHARGING BATTERY,WITH ENGINE RUNNING CHECK BATTERY VOLTS AT BATTERY SHOULD BE 13.5 - 14.5 VOLTS.IF NOT ALTERNATOR NOT WORKING CHECK ALTERNATOR BATTERY POWER FEED WIRE AND VOLTAGE REGULATOR WIRES FOR DAMAGE AND LOOSE CONNECTION. CHECK ALTERNATOR FUSE.BEFORE REMOVING ALTERNATOR.TURN OFF RADIO FIRST BEFORE REMOVING THE NEGATIVE BATTERY TO KEEP FROM LOCKING OUT RADIO.

Jul 17, 2011 | 1996 GMC Suburban

1 Answer

Replaced alternator and battery in 2002 Chevy Tahoe. Battery voltage remains between 9 and 14 (leaning more towards 9 and at times falling completely until trucks shuts off)


Hello,
When you say battery voltage how are you testing it? Are you looking at a gauge on the dash? Or are you physically testing it with a multi meter? If the truck is dying and you recently replaced the alternator and battery I would first suggest you to check all them connections again real good. Snug them all up. Check for corrosion and clean as needed. Did you replace the battery and alternator with new/re-manufactured battery and alternator? The alternator needs to put out at least 13.6 volts to charge your 12 volt battery or the battery will not maintain a charge. However the alternator runs the vehicle once it is started. The battery is used only to start the car and then the alternator runs it. So if your vehicle starts and runs and then dies you may have a bad alternator. Check your connections first and then test the alternator with a multi meter. Anything less than 13.6 volt will not suffice. 14+ volts would be the hopeful output of a good alternator.
regards, Tony

Apr 12, 2011 | 2002 Chevrolet Tahoe

1 Answer

Just installed new battery and gauge still drops below 14 amps when i put on a/c,use power windows and has stalled while driving a couple of times


The problem will be in the alternator,it is not charging enough,and it is on it`s way out,If this was at all helpful,please rate,the voltage at the battery should read with a volt meter,13.65 volts to 14.25 volts with the headlights are turned on,and ac on high blower motor.If it is not in this range,replace the alternator.

Jul 12, 2010 | 2003 Chevrolet Suburban 1500

1 Answer

Alternator not charging the gage saying not charging but charging 9 volts had alternator tested its charging 14-15 voltes its got a new battery not charging good enough


ALTERNATOR DRIVE BELT SLIPPING OR BATTERY CABLES NEED REPLACING IF THEY ARE THE ORIGINAL ONES.THE VOLT GAUGE COULD BE FAULTY.TO TELL GET A DIGITAL VOLTMETER HOOK TO CAR BATTERY CRANK CAR UP.BATTERY VOLTAGE SHOULD BE 13.5 TO 14.5 VOLTS. WITH NEW CABLES. IF NOT CHECK ALTERNATOR FIELD WIRES FOR DAMAGE ALSO ALTERNATOR POSITIVE WIRE FOR DAMAGE.

May 30, 2010 | 1994 GMC Safari

2 Answers

My battery light came on and my battery dies like i aint getting a charge and when i charge the battery it starts everytime alternater is good what could it be


How do you know alternator is good?
Put in a cheap volt gauge.
Should read 12.5 normal.
Down to 10 starting.
Back to 12.5 at idle.
Up to 13.5 when engine revved up.

But battery low on water will not hold charge.
Could also have internal short.
Volt gauge will show.

Could also have something staying on, like engine or trunk compartment light?
Pull one battery terminal, and see if test light lights up across gap. If it does, even weak, you have a constant drain. Could be alternator. When diodes go bad, alternator can drain battery. Disconnect things until light goes out.

Feb 24, 2010 | 1999 Ford Taurus

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