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Look at the comment #117. The wire diagram. Look at the S1 master switch, pin 26. Wire P66D16 runs from S1-26 to TB 5-9. During start up, you should have at S1-26, 24 VDC. At TB5-9, you should have 24 VDC. From TB5-9, the wire goes through J2 and J3 and comes to the K5. It should have 24 VDC there also. so you need to measure the path to see where you are losing volts?