[VetteVet]

Cold increases resistance to current flow so it may be something as simple as the cranking amps of the battery. I would say that 600 cca or less might be the cause especially if the battery is older. There are too many other things that might cause the problem also. The two large terminals inside the solenoid are what sends power to the starter windings and armature. They are connected by a copper washer inside the solenoid and if there is arcing on the washer it would cause high resistance and a poor contact to the starter. I have included a picture of how all this works. If the battery is ok and all the connections are good then I agree with 89 crew that a new starter is the best option. VV