Question about 2003 GMC Yukon

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Was wondering how to check the alternator to see if it's charging in my 2002 GMC Yukon ?

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Try placing a screwdriver at the back of the alternator with the engine running. Be extra careful not to touch anything but the back center of the alternator. If it has magnetism, it is usually good . If not it is bad.

Posted on Nov 20, 2009

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Alternator is new.battery is new. GMC Yukon is not charging. What could the problem be.


Not sure but I believe the GMC Yukon has an in line fuse in the charging line. If so the output of the alternator will not get to the battery. One way to check is to measure the voltage, when the engine is running. At above idle it should be over 13 volts. Then measure the battery voltage, it should be almost the same within 200 to 400 mVolts. If not the charging line is open. Also if the alternator charging terminal is the same as the battery (12 to 12.7V) while the engine is running, that again indicates the alternator internal regulator is bad. If you turn on the headlights with the engine running above idle and the alternator output drops over a volt or so, the alternator is bad. This measurement can be taken at the battery plus terminal or the alternator charging output.

Feb 10, 2015 | GMC Cars & Trucks

2 Answers

My 2002 Yukon Denali alternator wont spin


Defective alternator , replace and check tensioner , and tensioning of belt .

Jan 22, 2013 | 2002 GMC Yukon Denali

1 Answer

My 2002 gmc denali is not starting...we have changed the battery ,alternator and fuel filter and it just comes on bt will not crank..what do i do..


check fuse box under hood for alternator fuse /relay and check check all of them that go to ignition/starter......

Dec 25, 2010 | 2002 GMC Yukon Denali

1 Answer

2002 Gmc Yukon xl. Drove it one morning and returned home than ten mins. later went to start it and nothing. Dead. Turn key to on and all dash lights go our and nothing. Doesnt crank or anything. ...


Take the battery out of it and go to a auto store to get it checked, they do that free, but you might need to get it charged or get a new battery. If it clicks then it's definitely the battery, otherwise it could be something completely different.

Things to consider
-oil change?
-last tuned up?
-battery age?
-Alternator?
-check fuses?
-are you aggressive while driving it, that can cause internal engine problems over the years.

hope it helps.

Dec 12, 2010 | 2002 GMC Yukon XL

1 Answer

Hi! I have a gmc Yukon xl that recently the battery light has come on and it reads battery not charging. The car starts fine and runs well, does that happen when the alternator I going out?...


That is correct! Your alternator isnt putting out the necessary voltage/amperage to keep the battery light off.

Have the vehicles charging system checked at a local parts store. They can also do a free load test on the battery. Just to be sure.

Nov 01, 2010 | 2003 GMC Yukon XL

1 Answer

I need to recharge my ac in a 2002 gmc yukon where


your charge port is under hood on the line going to accumulator.look for black or blue cap with the letter L on it.WARNING BESURE TO WEAR SAFETY GLASSES.

Jul 20, 2009 | 2003 GMC Yukon

1 Answer

Buzzing sound coming from engine compartment of 2002 Yukon


you might check and see if you have a noise suppression filter on the alternator,it sounds as if this may be your problem.

Apr 29, 2009 | GMC Yukon XL Cars & Trucks

1 Answer

2002 Yukon won't start


try cleaning battery cables if not that check starter

Apr 12, 2009 | 2002 GMC Yukon Denali

1 Answer

2002 GMX Yukon Denali XL will not start and battery has a charge.


get a boost to start it. after you start it let it charge up the battery on it's on. if it does not charge the alternator might be defective.

Mar 18, 2009 | 2002 GMC Yukon Denali

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