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gomi_otaku
gomi_otaku, Technician
Category: UK Car
Satisfied Customers: 3378
Experience:  VW Technician, VW FastTrack, VW Academy, VW Certified
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09 hummer h3 Whats wrong when my lights dim then go bright

Customer Question

09 hummer h3
Whats wrong when my lights dim then go bright when I come to a stop
Submitted: 15 days ago.
Category: UK Car
Expert:  david craig replied 15 days ago.

Hi Im David, are you talking about headlights? interior lights?instrument panel lights?

Customer: replied 15 days ago.
Head lights
Expert:  david craig replied 15 days ago.

how long have you had the vehicle? and did this just start happening or has it been going on for a while?

Customer: replied 15 days ago.
6 months and just noticed it here lately, I thinking due to the cold weather may need a battery
Expert:  david craig replied 15 days ago.

if you are sitting idle, your accessories are all at the lowest rpm. if you have a load on the engine, i.e. heater on, radio on, phone charger, and if the heat is selected to defrost, the ac compressor is actually cycling on and off to keep humidity out of the cabin, its going to pull a load on the alternator up and down, hence bright...dim...and yes a weak batter would be the culprit. if it over 4 years old, its definitely time for a new one.

Expert:  david craig replied 15 days ago.

please accept the answer and leave a positive rating for me if you were satisfied with my assistance. its the only way i get credit for my help. thanks and have a great week

Expert:  gomi_otaku replied 12 days ago.

Do you still need help with this question?