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I own an 87 and the service manual and the electrical diagnosis manual and I use them frequently when I help posters in this section and I have never seen in either manual that the starter solenoid should get at least 6.x volts. Where is it, I'd like to see it. If you ever have 6 volts of drop across three electrical contacts, you better find out why, one or more of those contacts is defective! I am an electronic engineer, this is why I don't buy the 6.x volts statement!
Answer:
jfb, here's the FYI and it's straight out of the 87' Corvette FSM. 'Engine Electrical 6D-3', Diagram 6D-2, General Electrical System Diagnosis 2 of 2; No Cranking, No Sound from Solenoid.
"More than 7 volts...." "Less than 7 Volts...." In other words, 7 volts is the minimum! And with all the circuitry involved, I wasn't surprised that I got 6.6 V. Now that everything is soldered, the problem has gone away.