not sure when but the advent of modern transistors in the radio is probably the reason gmc and others went to positive hot. prior to transistors, radios utilized a vibrating tube which would operate either neg. or pos. ground. modern transistors will operate one way typically pos. hot, neg. ground and since most vehicles of the era were wired so, gmc changed to positive hot.
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Today's Featured Article - Stories From Old Farmer - by K. Pratt. Old Farmer, a.k.a. Dale Jensen began posting messages to our discussion forums at the grand age of 75. With extensive knowledge of farming and tractors, he valued the past and the ways that went with it. He shared these values with us until shortly before his passing. I spoke with Dale in his last days and requested his permission to share some of his stories with the readers of our magazine. He agreed, and provided the
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