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Old 01-19-2015, 12:35 AM   #3
VetteVet
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Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,563
Re: Under Dash Relay??

That is probably the TCS relay. An emissions rely that the factory used to comply with EPA regs in the early days to control emissions by retarding the ignition timing . It stands for transmission controlled spark.

Here is another view.

Name:  Horn and TCS relays.JPG
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