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All 1970 corvettes had the Transmission Controlled Spark(TCS) system. It essentially disabled vacuum advance under certain conditions.
As part of that system there is a two-terminal coolant temperature switch on the right head between the two rear spark plugs. (see image)
The two terminals of the switch are tied together with a Green wire which leads to the TCS relay mounted on the firewall. Some have a direct connection wire between switch and relay, others may have a simple single wire connector in between.
Which does your '70 have and what is your build date?
The green wire is shown here:. The single wire connector is circled
My build date is 2/11/1970.
My green wire is damaged...spliced. So I can't be certain.
However, from the point where the green wire enters the wiring harness, to the splice is 20 inches.
Whereas, the examples with connectors seem to only have a couple of inches of length at the harness.
So it appears that no connector was present 2/11/1970
Calling all 1970 vettes
