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Old 01-19-2015, 12:35 AM   #3
Msgt USAF Ret

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Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,568
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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metallic green 67 stepside
74 corvette convertible
1965 Harley sportster
1995 Harley wide glide

Growing old is hell, but it beats the alternative.
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