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Old 06-11-2014, 01:14 AM   #4
VetteVet
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Join Date: Jan 2005
Location: Kalamazoo, Michigan
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Re: What Is This? (Engine bay, 1970 C10.)

At first I thought it was a relay for the TCS system ( transmission controlled spark) but that didn't start until 1971 I believe. It also looks like the AC fan relay. Does the AC work in the truck?
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