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#1
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The first item on Tom's list following "replace CB" turned up a voltage drop at the input wire of the regulators compared to the battery voltage - about .1 - .3 volts. We checked the master switches and aluminum No. 6 KPB54 wire, and found the voltage drop to reside in its approx. 31 in. length. The end attached to the main bus had 2/3 of its strands disconnected and frayed at the connector. The swaged connector was loose, and rotated semi-freely about the remaining strands!
We replaced the KPB54 wire with copper (also No. 6), and a jumper on the board for good measure (also No. 6 Cu wire). We then ran the other two multimeter checks Tom suggested which didn't call for engines to be running, and everything checked out. We're hoping this fixed the problem. I'll let you know after test flight - apparently we broke a P-lead on the rear R mag while multimeter-testing, which we fixed yesterday, then observed oil in the rear engine, which we'll try to troubleshoot tomorrow. It's always something...
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Paul T337C 
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#2
09-25-11, 09:54 PM
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The broken P lead turned out not to be the problem, but rather it was a broken impulse coupling spring in the mag. Had to take off the starter and some baffling to remove the mag. Mag checked out OK - now let's go flying!
After landing, the regulator now maintained voltage at 27.5 - 28 v even with the pitot heat, landing & taxi lights on, and everything else I could turn on, so long as RPMs were around 1300. Hot dog, it may be fixed!
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Paul T337C
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#3
09-26-11, 09:33 PM
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Way to chase it down Paul. Lot's of good help out there and on this post. Copper cables are a good idea. Blue skies
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Herb R Harney 1968 337C Flying the same Skymaster for 47 years
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