Question about 1999 GMC Sierra

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I have a 1999 gmc sierra 1500 my amp gauge is going from 16 to 9 then I start loosing all power to my interior and no head lights or anything engine still runs fine can happen for a few miles then eve

Had alternator and battery checked they r both running at 14 amps and alternator passed all tests at auto zone. amp gauge moves from 16- to nothing

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  • GMC Master
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You may need a shop manual to get the wiring diagrams and test procedures.
The alternator output should be around 14 volts unless you have a heavy load such as headlights or the heater blower on high.
If voltage goes above 14 the regulator could be faulty even tho you say the alternator checked out ok on a bench test.
The regulator gets a power signal from the gauge on the dash to energize it. There could be a loose connection somewhere in the charging system, or something in the instrument cluster. Even the key switch could be a factor.

Posted on Jan 17, 2013

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SOURCE: 96 gmc sierra hard to crank after 12-14 hours

that has a votec engine in it the fuel pressure is droping at knight and it takes 60 psi before the injectors will fire most likely cause fuel pump ,leaking injector ,or a feul pressure regulator

Posted on Jul 14, 2009

Mustgo
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SOURCE: battery test proper voltage, new alternator test

Battery by itself with no cable attach should read 12.4V for low and 13.6V for fully charged.

With both terminal connected a health charging system should read 13.6 to 13.8V

Amp gauge should read positive when chagring and when discharging it should be on the left (negitive side)

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Troubleshooting

Key has to be out of the ign.

Charge battery to the max with terminals off the car.

Test voltage and make sure it's between 12.8 to 13.6V

Check the battery CCA and compare it with a battery load tester.
CCA that read 60% below the sticker is a BAD battery.

Cannect the + terminal.

Carefully touch the negitive terminal to the neg. battery post.

Make sure all doors and light are off

You should get a little spark.

A large spare is equal to a large load.

An amp meter will give you a better idea what the drain is.

A short is hard to find and it will take time.

Work on one fuse at a time until you find the load.

Posted on Jul 17, 2009

  • 101 Answers

SOURCE: I have a 2002 GMC sierra 1500. Instrument Lights Not Working

When dash lights don't work odds are the tail lights don't work either.Sounds like Dimmer switch may be a problem.

Posted on Oct 02, 2009

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SOURCE: Rear-end grinding noise in 1993 GMC Sierra 1500

your description sounds like the gears inside the the same differential you just replaced.

Posted on Oct 13, 2009

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SOURCE: My 2004 GMC Sierra 1500 has been losing battery charge

Try to locate the cause of the discharge current as below:-

While vehicle electrical system shutdown as for overnight storage, connect an ammeter (with suitable current capacity and sensitivity) across the main ground connection between the battery -ve terminal and vehicle chassis/frame - (-ve of the ammeter to -ve battery terminal post, +ve to vehicle frame),
Carefully disconnect the main battery ground cable from the chassis,
The ammeter will now measure the battery discharge current - a discharge current in the order of 0.5 amp or more is of concern.
If all is well, the current draw should not exceed 50- 100 mA.
Note- Do not switch on any load while ammeter is connected, as ammeter damage or overload will occur.
If an excessive discharge current is observed, remove all fuses etc to eliminate / locate cause.

Posted on Oct 14, 2009

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