Question about 1991 GMC Sonoma
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Posted on Jan 02, 2017
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
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
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
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
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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