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Current flows to the cold start valve whenever the starter is engaged, and if the temps drop below about 86 degrees (that's what your testing in the chart in Anthony's post), then the thermo-time switch grounds and allows the cold start valve to be energized.
If it's cold enough for the thermo-time switch to ground, then the "time" part of it will allow it to energize the cold start valve for about 10 seconds max in the coldest conditions before it de-energizes the cold start valve..
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Raymond
1979 928 5 spd
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