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Longhorn Man · 02-12-2011, 06:40 PM

outers are low/high inners are high only.
when on in low beam, only the outers are on
when on in hight beam, all 4 are on.
T3 made both the inner and outer, plus the larger 7 inch bulbs too

02-12-2011, 06:40 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: GMC headlights outers are low/high inners are high only. when on in low beam, only the outers are on when on in hight beam, all 4 are on. T3 made both the inner and outer, plus the larger 7 inch bulbs too