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· Premium Member
1,885 Posts

Thanks for fixing the pic.
what is the TCS?
TCS stands for Transmission Controlled Spark...GM started using this in 1970. That relay was riveted to the rain gutter and the wiring ran to a switch on the tranny and to a vacuum solenoid on the intake manifold. The system only allowed for full vacuum advance when the car was in high gear...this was an early smog control device.

The relays in your photo look very similar to the TCS relay...I was just being funy with the triple TCS comment...good luck.

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