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2003Gmc van, auxiliary switch doesnt work, what is it

Customer Question
SUPPOSED to do?...
2003Gmc van, auxiliary switch doesnt work, what is it SUPPOSED to do?
Submitted: 2 years ago.Category: GMC
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10/13/2015
GMC Mechanic: edhunt0r, ASE Certified Technician replied 2 years ago
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edhunt0r, ASE Certified Technician
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