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Just for information. When your governor reaches on speed, it turns the whole system on. The dash relay energizes the operating solenoid so both are hot until it shifts up into overdrive. While in overdrive the dash relay is still hot but the operating solenoid goes into a holding coil mode that uses less energy to operate. As was already mentioned, the electrical system needs to be maintained in good condition. High resistance equals higher current draw. I'm glad to hear the OP found the problem. New reproduction overdrive harnesses are available. I always keep a new one on hand. The swampy conditions under the car are hell on electrical systems.