Question about GMC Yukon Denali

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2004 GMC denali - has high current draw when running only. Had to replace battery and alternator but still having battery drain and low idle rpm due to current draw. Off position quiescent current is fine. No codes or lights at all - everything functions normally (windows, locks, lights, radio, hvac). Pulled fuses one at a time and nothing obvious. Any suggestions ??

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Use this

sold at mcm elctronics or amazon
seen here

and here

finding drain, the techniques are the same for all cars.
clamp on , and look.

Posted on Oct 13, 2013


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SOURCE: 2004 Honda Civic -Code P0122 Throttle Position Sensor Voltage Low

yes, this is the case of a failed throttle body, in which case it needs replaced, the car is getting too much fuel causing the high idle. this needs replaced asap. you could proably find a small independant honda shop that could do the work for less.

Posted on May 12, 2009

SOURCE: 1993 Buick century Battery dies after sitting for

From what I get,you have a battery (12.31 Voltage Drop) all the time
No way all the fusable links are out of system
That is kind of extreme to cut them

Go to 20AMP first, and put the meter back in series,as your were.
If you get anything over 30 Mili Amp ,and it doesn't time out after 10 min,you found the issue.
The fuses out ,should have killed that.

Posted on Nov 07, 2010

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My 2008 X5 has recently stalled a few times when at a stop sign and wont restart for 20-30 minutes. I have narrowed this down to happening ONLY when the AC is running. Any ideas?

This is a long shot, but try this. It may be that your battery is very low on fluid (acid water). The car runs off the battery with the alternator constantly charging it. If it is too low on acid fluid it will not take enough charge. At highway speeds the alternator will put out more amperage and compensate for the weak battery. When the engine is a idle or low RPM the alternator charges less. The AC unit draws current from the battery. AC draw may just enough to overwhelm the weak battery and kill the engine. After the car sits for a little while it is able to crank the engine, partly because the starter, when cool, draws less current. Check the acid/water level in the battery and if adequate, have the battery checked for a dead cell.

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I have loss of power and when fan is turned on the idle drops killing the engine. What could be the culprit?

This seems to be pointing toward the alternator. When the fan is running, this can take a chunk of available current from the power supply. If possible, check the voltage across the battery when the engine is running. It should be up around 13.8 volts but doe this when you only have the engine running and no radio, fan or anything else switched on. If that's low, possibly 12 or lower, then the alternator needs either the connections checking for corrosion, the belt that it runs off tightening or replacing.

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1978 chev k10 alternator output 14.4 on bench, reads 9 amps on truck gauge 12.2 on ampmeter at battery with truck running why

amps reading on the truck amp meter is the current that is being generated to run everything as well as charge a battery that will be at best around 80% charged.bench testing an alternator gives these readings as the regulator is feeding into fully charged batteries with no draw on the system. When batteries are 100% charged the charge rate will be as low as 2 amps but in a car where there is a current draw for the ECM , ignition , fuel pump and what ever the alternator feeds these first before it charges a battery. You used a amp meter to get a voltage reading which is reading the voltage drop across the current draw. If you had used a voltmeter (multimeter) then you would see a voltage increase with the rpm increase. The

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My Yukon drains the battery and the charging system isn't working. plus when I jump it off I get an arc like my cables are crossed. what is happening?

It arcs because there is current draw from the jumper cables to your vehicle. The system also will be drained if the charging system is not working. Turn the truck on and raise and hold the rpm to about 2000-2200. Turn on all electronics that you can find(blower motor on high, headlights, rear defrost, wipers, 4 way flashers, etc.). Measure the voltage at the battery with a voltmeter; it should be 13.5-15.5 volts dc. If it does not measure in that range the alternator is most likely bad. A worn alternator belt can also cause it not to charge from slipping/being loose.

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My 2004 GMC sierra Denali pickup battery drains

After you get the truck started disconect you battery cable and see if the truck continuse to run. if it dies you are having a problem with the charging system. make sure dont have any interior lighs left on.

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The problem: 2001 mitsubishi galant es will not continue to run first start up in the morning

For idle issue,click the help links provided below :---

Bad miss at idle? Engine stumbles coming off idle when warm?


While stop engine idles like cylinder missing?

Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed?

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Erratic idle on car?

Low idle when cold out side?

Idle Air Control (IAC) Valve Replacing?

intermittent engine failure while idle?

Engine quits at idle?

Car overheats and Air blows hot at idle?


Car not starting or turning over indicates towards multiple possibilities. It can be issue with battery or weak battery. But if battery checks out ok, then it can be starter issue or faulty alternator or problem with low fuel pressure or no spark at spark plugs due to dirty spark plugs or faulty ignition coil or injectors getting cracked or dirty and needs to be cleaned.

To confirm the problem, the basic troubleshooting is required.

Click this link below and follow the troubleshooting:------


This will help.


Feb 26, 2012 | 2001 Mitsubishi Galant

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Replaced coolant sensor on my 2004 GMC Envoy XL 6 cylinder. I had to disconnect the battery and alternator. All was reinstalled,truck runs fine but when I turn on the a/c the truck turns off and idles...

Sounds like ac compressor is dragging.It might be that rpm is to low also.Step on the accelarator and if you have a tach bring rpm up to 700 to 800 in drive which is were it should run with ac on. With ac off rpm should read around 600 in drive.

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2003 Ford Mustang GT Battery Light

Your alternator should power everything when engine is running. Battery is only for start up. Test voltage with a multimeter when engine is running , should be 14V or more . Any less indicates low alternator output.

Jun 02, 2009 | 2003 Ford Mustang

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Not charging at low idle

How have you determined "not keeping up"?

We need to diagnose whether the culprit is the alternator or battery (or something else like an accessory drawing more than normal current)

With a digital voltmeter (not analog) , measure battery with car off, then compare battery at idle.
Off reading = about 12.6 - 12.8 volts DC
Idle reading must be higher than above or no charging will take place, Idle volts typically 13 - 13.5 and should increase a bit with RPM until regulator limits the increase.

Some possibilities are :
  1. bad diode in alternator (can be replaced separately in many alternators)
  2. bad regulator (built-in to modern alternators)
  3. bad connection at battery terminals (wire brush or use battery terminal cleaning tool)
  4. bad battery (shorted cell, often caused by allowing water level to go below tops of lead plates)

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