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Re: How much amperage do you think GMC headlights pull?
Need to know the amps or watts of headlights you are using to answer that question. The relay "mod" simply allows power to go directly to headlights instead of being channeled through more wire and a usually old switch with not so good contacts resulting in brighter headlights. Even with a new switch the results are positive with a more direct path for the power.
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