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Have two Coast to Coast Challenger cranes. On both claws, the voltage will not increase over 35v, even though there's plenty of room left to turn the knob. In test mode, the VR3 shows 45v, but on this crane, it's a default max setting and I cannot alter the VR3. I measure these at the terminal above the claw during test mode. The analog meters in both games work and match my meter readings. The coil and pots have been changed on one, but not the other (since there was no improvement). The power supply also reads 49.6v at the power supply, and drops to 44.1v when activating the VR1 in test mode. I'm at a loss on this. Especially since both claws are doing this. Please advise?