The 1947 - Present Chevrolet & GMC Truck Message Board Network - Random Pig Tail any clue what it's for?

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Cesar Diaz

08-25-2017 12:09 PM

Random Pig Tail any clue what it's for?

1 Attachment(s)

1972 C10 402

This electrical pigtail runs off the main wire harness right by the firewall.
I am not original owner and can't figure out what it's for any help would be appreciated.

VetteVet

08-25-2017 12:32 PM

Re: Random Pig Tail any clue what it's for?

1 Attachment(s)

Most likely it is a plug for one of the TCS relays used in late 70 through 72 trucks as part of the Emissions control system that most guys disconnected as soon as the trucks cleared the showroom floor.

TCS= transmission controlled spark.

Here's a pic of the relays.

Attachment 1684260

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