Re: 72 GMC Short Step Build
I'm reaching deep through the cobwebs in my brain, but I believe it has to do with the grounding differences between the incandescent and LED bulbs.
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1999 GMC Suburban K2500 SLT, 454/4L80E
1991 Z/28, 6.0L/T56
1949 GMC 250, S10 Frame, 6.0L/4L80E
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