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2006 gmc sierra 1500 5.3 L33 4x4. Headlight flicker

Fergie49

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Fergie49 New Member

Fergie49

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My 06 sierra has headlight flicker after a heavy tow..alternator was new .battery new ..replaced headlight switch..checked ground wire on firewall.i unplugged my trailer brakes.unplugged the 6 pin connector...still flickering.. Im going to change the alternator..but i need to know what voltage to go with..145? 160? ..the volt meter is usually sitting at 14/15 volts at idle..drops down during driving conditions to like 13.5.whats going on with it.??

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