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f it were mine I would pull the voltage regulator field fuse sitting between the voltage regulator and start the following. a. With the fuse pulled remove wire137A from terminal 5 of the A1 voltage regulator and measure resistance from that wire to terminal 7 on the reconnect board...

The very first thing you need to do, is check if all the parts to your volt reg system are from the same manufacturer. Establish that your volt reg, R1, R16 and the power transformer are from Libby or TRC. One or the other. You CAN NOT MIX PARTS. Do that, and then we can go farther. But this...

The TQG's on the whole have a real problem with loose connections, and Canon plugs. Also try disconnecting the A2, and then try and start it up. But keep an eye in the volt meter, and a hand on the S7.