Question about 2002 GMC Sierra 2500HD

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Started 93 gmc sierra Z-71 started it and it turned over once and every thing shut down i cant lower windows, no gauges but the battery has 12 volts

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Sounds like a bad battery ground cable

Posted on Jul 19, 2008

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The message center came on all of a sudden with a host of items such as service 4wd, service abs, battery light. The abs dash light came on and the gas gauge and temp gauge also quit at the same time....


Have a repair shop scan the vehicle for codes
& diagnose them

I fail to see,if your here,what you can do, without
professional tools & knowledge needed to use them

Jul 27, 2014 | 2002 GMC Sierra 1500

1 Answer

Voltage gauge drops alternator squeals. When using plow


INSPECT BATTERY ELECTROLYTE LEVEL
INSPECT BATTERY CABLES/TERMINALS
LOAD TEST BATTERY,_______VOLTS @ 150 AMPS (Min SPEC 10.2 VOLTS @ 150 AMPS.)
INSPECT BELT(s),
TEST ALTERNATOR OUTPUT (ON THE VEHICLE,'NOT' BENCH TESTED),
1 _____AMPS @ 12 VOLTS @ 2500 RPM w/PLOW not ENGAGED
2 _____AMPS @ 12 VOLTS @ 2500 RPM w/PLOW ENGAGED ALT OUTPUT SPEC ????

Feb 04, 2014 | GMC Sierra Cars & Trucks

1 Answer

2003 sierra gauges not working plus dash plus drains my battery any suggestions ?


Try this simple trick. Shut off every thing in your vehicle, radio, ac, lights, windshield wipers etc.Turn off the vehicle put it in park. Disconnect your battery , wait 5 minutes. Then Without turning any thing on leaving the vehicle in park reconnect the battery start the vehicle and let it Idle for approx 10 minutes. This allows your computer to reset all of your gauges. By assuring that everything is off your computer can concentrate on resetting everything correctly without missing a step . This will set your Idle and all of your Gauges. Whenever your battery is disconnected for what ever reason this step should be followed immediately upon reconnect.

Nov 16, 2012 | 2000 GMC Sierra

2 Answers

I have a 93 sierra,4.3 liter, put new plugs,cap,rotor and the ignition relay is good. it gets gas cause i smell it and it turns but will not start.what could be the reason it will not start? its a new


check the fuel line pressure on the injector rail ,here you will find a valve that looks like a tyre valve and take the cap off and connect a pressure gauge to this and see what you get should be around 55lbs

Mar 30, 2012 | 1993 GMC Sierra

1 Answer

Ve.comso heres my issue: when i turn the key most of the time nothing happens. but sometimes my dash lights up and then the truck starts. i recently had to boost the truck; could i have fried the starter...


Check the battery terminals first to make sure they are tightened and not corroded, if you have a way to check the battery that would be good [ you may have a voltage gauge on the dash, when you first turn on the key it should register at least 12 volts, and not drop below 9 volts when cranking ], a load tester is the best way. If all these things are ok, then I would suspect the igntion switch is faulty as it seems you have no power to anything at times.

Mar 17, 2011 | 2006 GMC Sierra 1500HD

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

1 Answer

Won't start after battery died and recharged


Sounds like low voltage.
Get a boost from another car with a good set of cables.
Once started check voltage with booster car disconnected.
Is it around 14 volts?
If so,the truck is charging, so it may be time for a new battery.

If the voltage is at 12 or lower while running the truck is not charging.
May be time for a new alternator.

The battery should have charged enough in 1 hour to start the truck.
You may need a battery and alternator.

Sep 07, 2009 | 2002 GMC Sierra

1 Answer

Battery drain 2001 gmc 2500 hd pickup


On cold start up, starts fine.When i start driving all gauges needles start to sweep.. fuel empty to full spedo 0 to 100 amps and oil gauges sweep back and fourth. emerg brake gos on and off message center flashes battery in red and yellow.
seems like its possessed..

Mar 15, 2009 | 2001 GMC Sierra 2500HD

1 Answer

2002 GMC Sierra High Voltage


could be just a bad gauge,thak it too auto zone and have them test it while its on the truck,if it reg the same on their tester then your got a short

Feb 28, 2009 | 2001 GMC Sierra Crew Cab

1 Answer

2006 GMC Sierra electrical problem


If your Sierra has a Duramax, it may be the intake air heater or the fuel heater cycling on and off in the cold weather. But if its pulling the voltage down to 12V after warmup, I would suspect a poor battery. As suggested, get a load test at autozone or ??

Jan 16, 2009 | 2001 GMC Sierra Crew Cab

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