Question about 1999 GMC Safari

1 Answer

My 99 safari volt meter always stays on about 14 even at idle but recently it has started dropping to about 12 at idle then back to 14 when driving. what is this indicating?

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • GMC Master
  • 4,340 Answers

Not necessarily a problem. It depends on MANY things. If you are running lights, heater or AC, brake lights, all of these things can cause what you describe.

At speed (2,000 rpm or so), you need to be 14 volts or higher.

To test:

Fully charge, then load test battery.
If Battery okay, then load test the alternator to check output amps. If no tester is available, often parts stores will test for free.


Posted on Jul 28, 2010

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

96 cadillac eldorado etc battery not staying charged when the car is started the battery goes up to 14 when driving and press brake voltage drops 11-12(car may even die) and to 13+ if u give it gas


Does the vehicle start after sitting over night or do you need to jump start it . Is the charge light on ( batt. symbol ) at any time ? Serpentine belt good , tensioner good ? Battery cable connections good an tight and no corrosion ? Battery also good ? That is normal for battery voltage to jump up to 14 volts after starting , alternator is replenishing the battery after starting ,that draws down the battery . Going down to 11 or 12 volts when stopping and almost stalling isn't a charging system problem . You have a idle problem , IAC - idle air control valve or dirty air passage , a vacuum leak . Giving it gas and it going up to 13+ the alternator is working . Your best bet take it to a qualified repair shop and have it check .

Jan 27, 2017 | 1996 Cadillac Eldorado

1 Answer

My 1998 jeep GC has charging issues


Check all your grounding straps especially the one from your block to the frame if it is worn rusty or in bad shape replace it check your connections id bet it is just your ground strap

Mar 25, 2013 | 1997 Jeep Grand Cherokee

1 Answer

I have a 99 solara se. I have new battery and alternator but the car can't carry a load. Ac lights heater radio so forth


Not sure I follow your problem.
The alternator puts out 13-14 volts at idle but very few amps. If you turn on the headlights at idle the voltage may drop to 12 until you raise engine speed. The amperage goes up with engine speed.
Is the battery voltage at least 14 when the engine speed is 1500RPM or more ?

Jan 08, 2013 | 1999 Toyota Camry Solara

1 Answer

Charging problem. Have a 97 isuzu rodeo 2wd put new alt and battery in it and when I put a load on the volt meter drops to 12.7. At idle it's on 14 . Why is it doing this?


Because of the load. It will drop in voltage, this is normal. As long as it stays above 12 you will be fine. But just to be sure start the car and turn everything on, then check the voltage. If it stays at 12.7 it's good.

Aug 09, 2011 | 1997 Isuzu Rodeo

1 Answer

I havw a 82 Grand Prix with a 350 chevy truck engine ,recently my battery won't hold a charg (new battery ) i have cleand conections, checked fuses . any ideas thanks Rita


Put a volt meter across the battery terminals and check the output. You should be seeing around 13.5 volts at idle, no higher than 14. At idle with all accessories on, it should read just a bit lower but should not drop even after ten or so minutes. Your alternator has a built in regulator so when you get a new one, that's all you need. Also make sure the heavy red wire from the back of the alternator is secure at both the alternator and the battery (the extra small wire on the positive terminal) Any problems, ask me and I'll give you more if needed!!! Careful when checking the back lead on the alt...it's always hot when the battery is connected.

Jul 03, 2011 | Pontiac Grand Prix Cars & Trucks

1 Answer

GOT A 99 GMC SONOMA. THE VOLT GAUGE WAS SHOWIN BETWEEN 9 & 14 VOLTS. HAD BATTERY CHECKED,THEY SAID IT WAS BAD. GOT NEW BATTERY N IT DID SAME THING. GOT ANOTHER ALTENATOR,PUT IT ON NOW IT SHOWIN BOUT...


11-12 IS GOOD WITH RUNNING NOTHING ON WHATS IT ON . NOW TURN JUST HEAD LIGTHS ON DID IT MOVE ANY MAYBE 1-2 METERS THATS FINE . DRIVE IT!!!!!!!!!!!!!!

Dec 12, 2010 | 1999 GMC Sonoma

2 Answers

87 toyota camry new battery wont keep charge, alternator checks okay, in dash bulb for charge and brake and lights stays illuminated?


Generally if charge light is on, alternator has a bad diode in it. This lets the charged battery lose its power by flowing in the reverse direction. It sounds as the alt., is either not connected right or is swtill bad

Jan 18, 2010 | 1995 Toyota Camry

1 Answer

Voltage spikes and dips


Sounds like the ground strap is loose, damaged, corroded or missing.

The regulated alternator puts out 13.8 volts. 14 volts is not a spike; it is normal. If your idle is not steady, the voltage will flucuate around the numbers you are reading.

Install a ground strap from the engine to the chassis, even if the dealer doesn't want to...

hope this helps...

Sep 09, 2009 | 2001 GMC Sierra Crew Cab

1 Answer

I have a 1998 Nissan Frontier and I believe there is an electrical problem but I don't know where to look. i noticed that my ''Brake'' and ''Battery'' light was coming on and off and when it did my...


With a volt meter and the engine at idle, check the voltage at the battery.It should always be just over 12 up to 14 volts. At idle with no accessorys on (lights, fan, radio ect.) The voltage should stay just over 12 volts. As you turn on all the accessorys the voltage should rise up to between 12-14 volts.
Also, a new battery needs to be fully charge before use. Most new batterys sit on the shelf and lose charge. My last new battery needed 8 hours of chargeing to be fully charged.
I hope this helps.

Sep 03, 2009 | 1998 Nissan Frontier

Not finding what you are looking for?
1999 GMC Safari Logo

96 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

76846 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22246 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...