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1991 gmc Sonoma has low voltage on the dashboard voltmeter stays just over 9 volts just changed the alternator didn't help But I need help

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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keemo68
  • 1263 Answers

SOURCE: Voltmeter drops to 9 volts on Chev 454 P30 motorhome

this is eithere a loose positive cable from the altenator to the battery or the regulator in the altenator is about to fail. if you have not had any problems starting the vehicle then most likely its a loose connection between the gauge and the charginging circuit or the gauge is faulty. take a multimeter and test the charging votage at the altenator while the vehicle is running it should measure 13.5 volts and should not change more than .5 volts. if the voltage drops more than 1 volt the regulater is bad and the altenator needs to be replaced. if it is working fine then looke for a bad connection make sure all positive and ground cables are tight. if they are replace amp gauge

Posted on Apr 19, 2009

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  • 5 Answers

SOURCE: Battery light still on after changing alternator and battery.

i have a 2003 chevy silverado the riverse has not worked for 10.000 miles any sugesstionswhat this might be and or how much.

Posted on Jul 15, 2009

  • 881 Answers

SOURCE: tac not working voltmeter went to 19 volts then

Akternators for a 12 volt systum charge at 13.5 when running from 800rpm to max ??4000rpm and shouldent change as the alternator put out AC current and coverts to DC in the reg on alt but max of 13.5 is all you need at any time at all revs and the battery will not boil or over heat..
Make of truck dont make any differance and milage dosent either as its the alternator thats either faulty or regulator is.
Let me know how you get on Ron

Posted on Oct 26, 2009

  • 4 Answers

SOURCE: need wiring diagram for 1996 GMC Sonoma, I lost

On the 96 GMC sonoma my fuses are located on a small panel on the drivers side of the dash, it's hidden by the door when it's closed, you'll see a round knob. Under my hood is ONLY the master cylinder and cruise control unit. NO fuses are under my hood either. The relays are behind a panel in the glove compartment.

Posted on Jul 22, 2010

jsmes1027
  • 749 Answers

SOURCE: do the fuel pumps have a high failure rate for gmc

You should have 12v at that wire.Definitely would check for corroded or loose wiring especially on the ground that runs to the frame on this you are for sure losing enough voltage to cause the pump not to work. If possible try running a jumper wire from the battery to the pump power wire which I think is purple or red and see if your pump will activate.

Posted on Dec 28, 2010

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Dec 12, 2015 | 1991 GMC Sonoma

2 Answers

Check gauge light comes on and voltmeter shows low voltage


Not if your alternator is faulty.
Check the battery voltage first, that will prove alternator.

Dec 02, 2017 | Cars & Trucks

1 Answer

How can i tell if the battery or alternator is failing?


Get a cheap digital voltmeter. Check the voltage at the battery. Start the vehicle, checking voltage at battery. It should be greater than when the vehicle wasn't running. With vehicle running turn on the lights and heater blower, does voltage stay up or go down? Voltage should be at least 13.5 volts with the motor running. If the voltage goes down when the lights and heater are turned on then the alternator is not charging enough. If the voltage is up (13.5 or more) with it running and it will not start after sitting a short time then the battery is probably bad. Or go somewhere like Auto Zone and they will normally check it for free!

Aug 11, 2012 | 1991 GMC Sonoma

1 Answer

Starts with a jump but cuts off soon as cables are disconnected


Check your batteries voltage you need at least 12 volts.If you don't have 12 volts then put the battery on a 2-4 amp charge for 6-8 hours.Then if the battery does'nt have 12 volts get a new battery.If your battery has 12 volts afterwards and still cuts off then your alternator is faulty.With the engine running your alternators power wire should show 13-15 volts coming out.

Feb 03, 2012 | 2004 GMC Sonoma

1 Answer

Battery light stays on


Well in that case either the battery is faulty, replace it, or the Alternator is, however you need to check which one is actually bad, as if the alternator is faulty, and if so it would need to be replaced, then obviously the battery will go flat, so with the car running you need to disconnect the existing battery, I assumed one jump started? and check with a voltmeter if the alternator is putting out the 12 volts or so. Or take it to a garage and have them check?

Oct 12, 2011 | 1997 GMC Sonoma

2 Answers

1994 gmc sonoma with alternator putting out 11.7 volts no matter what you have on. New battery and rebuilt alternator. What else could cause this low voltage situation. The battery and abs lights are on.


Try checking the gauge inside the truck
If it reads wrong - not to worry - just carry on as it is.

Try turning everything on - then CAREFULLY remove the NEGATIVE battery cable - if the truck continues to run WELL - the problem is most likely the gauge.

Check it the local battery store - free.

Gary @ Fix Ya.

Jun 16, 2011 | 1994 GMC Sonoma

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

1 Answer

Tac not working voltmeter went to 19 volts then rh@stayed ther just purchased 2004 gmc1500 sierra . tac@voltmeter siezed low. gm dealer did sweep volt showed16volts tac dead 2days later voltmeter went...


Akternators for a 12 volt systum charge at 13.5 when running from 800rpm to max ??4000rpm and shouldent change as the alternator put out AC current and coverts to DC in the reg on alt but max of 13.5 is all you need at any time at all revs and the battery will not boil or over heat..
Make of truck dont make any differance and milage dosent either as its the alternator thats either faulty or regulator is.
Let me know how you get on Ron

Oct 26, 2009 | 2004 GMC Sierra

1 Answer

Blows fuses


Generally speaking, a fuse 'blows' because too much current is drawn through that circuit. In this case I suspect a 'short-to-ground' or a bad voltage regulator (inside the alternator in a GMC). First, I would check the alternator's output voltage. Easiest just to look at your guage. Up to 14 1/2 volts is normal on a GM (with truck running), if it's higher - you need a new alternator. If it's under 14 1/2 volts, you
MUST find the short. Unless you have the specialized tools, (short-circuit finder, voltmeter, wiring
diagrams, etc.) this should be left to a competent automotive electrical shop. It could be as simple as a wire's insulation worn off or a short 'inside' the ECM (you truck's engine control computer). No matter what, one trip to a competent mechanic will probably be cheaper than continually replacing the computer and/or towing bills. Good luck!

Nov 24, 2008 | 1992 GMC Sonoma

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