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

Question type: Maintenance & Repair

3 Answers

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
11,365

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.

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

Yukon XL

Looking for a Used Yukon XL in your area?

CarGurus has 6,834 nationwide Yukon XL listings starting at $1,499.

ZIP:

Search GMC Yukon XL Questions

GMC Yukon XL Experts

#1 FordNut
FordNut
Reputation 210
#1 TK76
TK76
Reputation 210
#3 kbro
kbro
Reputation 170
View All

Related Models For Sale

Used Chevrolet Suburban"
416 Great Deals out of 23,588 listings starting at $1,595
Used GMC Yukon XL Denali"
114 Great Deals out of 7,044 listings starting at $2,925
Used GMC Yukon"
241 Great Deals out of 9,562 listings starting at $2,500
Used GMC Yukon Denali"
191 Great Deals out of 9,249 listings starting at $2,800
Used Chevrolet Tahoe"
741 Great Deals out of 34,223 listings starting at $1,800
Used Cadillac Escalade ESV"
85 Great Deals out of 5,349 listings starting at $3,995
Used Ford Expedition"
457 Great Deals out of 19,079 listings starting at $1,750
Used Cadillac Escalade"
272 Great Deals out of 9,774 listings starting at $2,395
Used GMC Sierra 1500"
758 Great Deals out of 46,352 listings starting at $1,995
Used GMC Sierra 2500HD"
129 Great Deals out of 14,455 listings starting at $3,988
Used Lincoln Navigator"
89 Great Deals out of 5,914 listings starting at $1,950
Used Toyota Sequoia"
102 Great Deals out of 4,770 listings starting at $1,995
Used Chevrolet Silverado 1500"
1,873 Great Deals out of 120,481 listings starting at $1,500
Used GMC Acadia"
631 Great Deals out of 21,240 listings starting at $4,988

Used Cars For Sale

2016 GMC Yukon XL For Sale
3,820 listings starting at $41,910
2015 GMC Yukon XL For Sale
16 Great Deals out of 505 listings starting at $38,987
2014 GMC Yukon XL For Sale
8 Great Deals out of 129 listings starting at $26,900
2013 GMC Yukon XL For Sale
8 Great Deals out of 228 listings starting at $18,000
2012 GMC Yukon XL For Sale
7 Great Deals out of 135 listings starting at $16,975