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
8,385

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

Yukon XL
Looking for a Used Yukon XL in your area?
CarGurus has 8,736 nationwide Yukon XL listings starting at $3,920.
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 Cadillac Escalade ESV"
103 Great Deals out of 2,910 listings starting at $6,250
Used Chevrolet Suburban"
387 Great Deals out of 14,527 listings starting at $2,500
Used Mazda CX-9"
74 Great Deals out of 5,521 listings starting at $8,000

Used Cars For Sale

2015 GMC Yukon XL For Sale
25 Great Deals out of 4,051 listings starting at $44,995
2014 GMC Yukon XL For Sale
22 Great Deals out of 734 listings starting at $27,999
2013 GMC Yukon XL For Sale
22 Great Deals out of 493 listings starting at $25,999
2012 GMC Yukon XL For Sale
11 Great Deals out of 291 listings starting at $22,900
2011 GMC Yukon XL For Sale
13 Great Deals out of 483 listings starting at $16,900