My headlights dim when i roll my windows up or down. Ive replaced the battery. I think its the alternator not supplying enough power fast enough??

Clintd77
0

Asked by Clintd77 Jan 19, 2013 at 10:42 AM about the 2006 GMC Yukon XL

Question type: Maintenance & Repair

3 Answers

DavidH25
Not Active

You are probably correct. Have alternator checked, if you are a do it yourself guy, it should show 12 to 13 volts running and checking amperage output depends on what the alternator is rated, probably in the 60 amp or so category, but that's a bit more difficult to check

2 out of 2 people think this is helpful.
aztec626bf
7,425

Get yourself one of those cigarette lighter digital voltage testers. With the truck running you should have around 14 volts. With the truck off should have min of 12.5. Then run the window up and down and watch the meter. It should not vary more than a few tenths of a volt when running window up and down.

1 out of 1 people think this is helpful.
DavidH25
Not Active

Turn on your car's engine and let it idle. Don't have turned on such as lights and air-conditioning as you need to check the minimum alternator ampere output. Use a multimeter and set it to read amperes. Put the metal prong on the end of the black wire that extends from the multimeter onto the negative battery terminal. The negative battery terminal has a black cable attached to it and is labeled "Neg." Put the metal prong on the end of the red wire onto the positive terminal of the battery. The positive terminal has a red cable attached to it and is labeled "Pos." Read more: How to Check Alternator Amp Output | eHow.com http://www.ehow.com/how_7673351_check-alternator-amp-output.html#ixzz2IRAbbxOd

2 out of 2 people think this is helpful.

Your Answer

Add photo

Related Questions

  • 2008 GMC Yukon XL Electrical Issues. 8 answers

    For some reason the car sometimes goes dead after you turn it off as if the battery were dead. I can always tell when it is going to happen because the radio will turn off as soon as you turn the engi...

    2008 GMC Yukon XL SLT-1 1/2 Ton

    -

    Maintenance & Repair

  • when should the intake gasket be replaced on a GM motor? 5 answers

    2004 GMC Yukon XL 4 Dr Denali AWD SUV

    -

    Maintenance & Repair

  • Vehicle cuts out at turns and stops 4 answers

    Our Yukon stalls when turning a corner or coming to a stop. As long as its moving its fine. Could this be a fuel pump issue or water in the tank?

    2005 GMC Yukon XL 4 Dr Denali AWD SUV

    -

    Maintenance & Repair

  • no power 2007 yukon xl denali 45 answers

    intermitent no power last couple of days, decided to replace original battery. still no power.

    GMC Yukon Denali

    -

    Maintenance & Repair

  • 92 GMC Conversion Van please help!!! 3 answers

    There is something causing the battery to drain. After 48 hours the battery will be dead but it can be recharged enough to drive. If I unhook the battery it seems to solve the issue because it will ...

    1992 GMC Vandura G25

    -

    Maintenance & Repair

Yukon XL
Looking for a Used Yukon XL in your area?
CarGurus has 10,910 nationwide Yukon XL listings starting at $2,500.
ZIP:

Search GMC Yukon XL Questions

GMC Yukon XL Experts

#1 tenspeed
tenspeed
Reputation 90
#2 thbh
thbh
Reputation 80
#2 kbro
kbro
Reputation 80
View All

Related Models For Sale

Used Chevrolet Suburban"
796 Great Deals out of 20,097 listings starting at $1,995
Used GMC Yukon Denali"
206 Great Deals out of 5,948 listings starting at $2,988
Used GMC Yukon"
323 Great Deals out of 9,617 listings starting at $2,795
Used Cadillac Escalade ESV"
134 Great Deals out of 3,207 listings starting at $5,990
Used Chevrolet Tahoe"
1,059 Great Deals out of 33,065 listings starting at $2,495
Used Ford Expedition"
597 Great Deals out of 18,066 listings starting at $800
Used Cadillac Escalade"
278 Great Deals out of 6,750 listings starting at $3,999
Used Lincoln Navigator"
138 Great Deals out of 4,651 listings starting at $2,950
Used Toyota Sequoia"
137 Great Deals out of 4,743 listings starting at $3,500
Used GMC Sierra 1500"
929 Great Deals out of 61,706 listings starting at $990
Used GMC Sierra 2500HD"
168 Great Deals out of 15,074 listings starting at $3,995
Used Chevrolet Silverado 1500"
2,416 Great Deals out of 169,736 listings starting at $950
Used Cadillac Escalade EXT"
43 Great Deals out of 674 listings starting at $8,300
Used GMC Acadia"
837 Great Deals out of 34,179 listings starting at $7,295
Used Ford Excursion"
34 Great Deals out of 940 listings starting at $3,000

Used Cars For Sale

2015 GMC Yukon XL For Sale
4,071 listings starting at $43,977
2014 GMC Yukon XL For Sale
83 Great Deals out of 1,475 listings starting at $28,999
2013 GMC Yukon XL For Sale
71 Great Deals out of 894 listings starting at $26,999
2012 GMC Yukon XL For Sale
29 Great Deals out of 400 listings starting at $23,469
2011 GMC Yukon XL For Sale
56 Great Deals out of 654 listings starting at $21,995