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#1
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Exasperating
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Ran engines separately and adjusted both VR to 28.0v Running both engines together showed 27.9-28.1v fairly steady, even with a load of full lights. Annunciators appeared to operate normally....but...rear alt out light would blink occasionally. Looking closely at warning board, we determined terminals 1&2 and 6&7 were wired backwards, with terminal 2&6 to cathodes instead of 1&7. Fixed that, re-ran front engine and it shows 30v. Gave up and came home to some 12 year old Glenfiddich and read old Tom Carr posts in the CPA forum. I think I need to start over, but none of the troubleshooting guides in the service manual match these symptoms. |
#2
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don't forget to look at the trip out sensor.
had 2 of our 337s doing stupid electrical stuff and found the sensor had corroded pins. re pinned the connector and everything good. The other one I replaced the sensor. Its located on the copilots side of the pedestal. little rectangle box about the size of a pack of smokes. |