Question about 1999 GMC Sierra

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Need to know where and how is battery connected to voltage regulator to alternator in 1999 GMC Sierra?

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  • GMC Master
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Most regulators are in the back of the alternator and the 2 wires on the connector are the connection . The big wire to the alternator terminal is connected to the battery .

Posted on Oct 12, 2013


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Posted on Jan 02, 2017

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SOURCE: window regulator

If you are a hobby or trained welder you can fix the regulator provided the only problem is a broken cable. Remove the entire mechanism from the door and lay it out on a flat clean surface.I bought 1/8 cable (1/16 is actual size but 1/8 works on mine) and silver soldiered a hollow metal nipple onto the end of the cable. You have to install the cable on the drum first...measure the overall length of the old cable and then the resulting tension will be correct. If the old cable is too frayed for a length calculation then install a long length of cable onto the drum bolt on the regulator/motor mechanism and use needle nose pliers to hold cable 'extended' against the spring tensioner.
The entire mechanism can be installed into the window/door frame with a twisting movement which allows the two frames and motor etc to pass by the door interior structure until it lines up with the bolt holes. If you're really careful and have small arms you can place the window on the bottom of the door leaning against the door away from you and all the way toward the door hinges. That way you avoid issues of window removal and installation into a curved frame and rubber seal.

By the way, a new motor/regulator complete assembly is about $100 so weigh that against your time when you decide which way to go.


Posted on Oct 19, 2008

  • 9 Answers

SOURCE: 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 ??

Posted on Jan 25, 2009

  • 1050 Answers

SOURCE: rough idle,runs fine on highway

It is possible that the regulator is leaking into the intake plenum, or one of the injector lines has a bad O-ring and is doing the same thing. This was actually a big problem with this system on the 4.3L engines, but it is a little different on the 5.7. Before tearing into this this though, I think it would be a good idea to get a professional diagnosis. I would start with a compression test. The miss could be caused by low compression in one or more cylinders. The injector assembly has the regulator mounted right on the side of it and the whole assembly resides inside the intake plenum. It is not that difficult a job, requires some patience and skill, the worst part is the cost of the parts.
I've attached a picture of the injector assembly with the reg attached and highlighted


Posted on Mar 19, 2009

  • 3854 Answers

SOURCE: I changed batteries in my 2003 GMC Sierra key fob

1. Close all doors
2. Insert key into ignition
3. Hold down the power UNLOCK button on the driver's door panel, continue to hold down
until instructed to release in step 9.

4. Perform steps 5 through 8 in a fairly rapid succession.
5. Turn the ignition to the ON position (as far as you can go without starting the engine.)
6. Turn the ignition to the OFF position.
7. Turn the ignition to the ON position (as far as you can go without starting the engine.)
8. Turn the ignition to the OFF position.
9. Release the power UNLOCK button on the door panel. The vehicle should respond by
door locks locking and unlocking automatically. (If locks do not cycle after you let go,
not before you let go of the unlock button, then the vehicle has not entered programming
mode and you must start procedure over. Remove key from ignition, open drivers door
and return to step 1 ). If the locks do cycle automatically then proceed to step 10.

10. Hold down the LOCK and UNLOCK buttons on the remote until the doors lock and
unlock. This may take up to 30 seconds.

11. Repeat step 10 NOW for each additional remote. (Including any existing remotes).
12. Turn the ignition to the ON position to exit the programming mode.
13. Test remote(s).

Posted on Mar 06, 2010

  • 15 Answers

SOURCE: 1996 GMC Sierra 1500 XC 4x4 5.7 Hard To Start

It is probably the fuel pump. If I remember the number correctly, this fuel system needs about 50 lbs to open a valve.
Until this valve opens, no fuel gets to the fuel nozzels.

Posted on Apr 30, 2010

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Charging System for 2000 GMC 1500 Sierra 4x4

measure battery voltage while engine running good is 13V to 14V then over charging is 17V to 18V DC
if ok battery gauge could be defect
if not ok then look for stuck pulley on alternator belt by removing the belt and turn all pulley free.

hope it help

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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

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.

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2005 gmc sierra head lights brighten and dim while driving

This is caused by either a poor ground connection to the head lights or an overcharging condition taking place in the voltage regulator of the alternator, the spikes in output voltage causes the head lights to brighten up.

Aug 31, 2011 | 2005 GMC Sierra 1500 Hybrid

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2001 gmc sierra 1500. Battery light in msg center binks on and off. Voltage is fine. Battery is fine. Altenator is fine. Voltage regulator maybe?? Not sure if its located on the altenator or in the...

The regulator is in the alternator. Did you check voltage at the battery? Nothing in the diagram jumps out at me. Is the check engine light on? Maybe we could get a hint if there was a trouble code.bc11b1d.gif

Sep 26, 2010 | 2002 GMC Sierra 1500

2 Answers

Battery light is on belts are good not charging what could it be?

Battery light is directly connected to the voltage regulator of the alternator. If it is on, it means you have a bad alternator/regulator combination meaning a new alternator is in order.

This is a very common problem. That's why they have a light for it.

Wish you luck on this one.

Jul 02, 2010 | 1997 GMC Sierra

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The FREAKIN Battery

it probably just boiled over,check battery voltage in engine off it should read 12.7-13.2 volts/then with engine running chk for 13.7-14.5 both ball park figures, if in the high 14s you could have a defective regulator in your alternator causing over charge

Sep 12, 2009 | 1999 GMC Sierra 3500

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Voltage gauge on 2003 gmc sierra pegs out

have u measured the voltage at the battery? if not do so and post it back here. if it is more than 14.6 volts u have either a shorted cell in the battery or a defective voltage regulator in the alternator

Jul 27, 2009 | 2003 GMC Sierra 2500HD

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Wiring Problem on 96 GMC Sierra

call dealer for the alternator 2 pin connector pigtail. they will know what your talking about.

plz rate

Feb 01, 2009 | 1999 GMC Sierra

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1999 Gmc Sierra not charging

Sounds like the alternator/regulator assembly is getting weak. The cold wreaks havoc with electrical equipment. Probably need to replace it prior to failure. Hope this helps.
RPM Northwest

Jan 27, 2009 | 1993 GMC Sierra K1500

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