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Jims Web Site
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Date: 1-20-2014
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Number of Hours: 3.00
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Manual Reference: (none)
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Brief Description: CDI problem
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In the process of trying various things to get the engine to run, local A&P Robert Nin dropped by with various suggestions. The best, I think, was that when the engine was cranked, the battery voltage dropped too low for the CDI to function (Robert wa instaling a cdi on a certificated aircraft at the other end of the fied, and had recently fought some of the same battles).
I tried placing a digital voltmeter across the battery terminals. Sure enough, when cranking, the votage droped below 6 volts indicated. Since the DVM is not an instaneous instrument, I don't know how low it may have droped, but it was obviously too low for the CDI to function.
Lightspeed suggests one may want a 12 volt 3.5 amp backup battery, in case the alternator fails, and the main battery cannot power things. They keep this battery charged through a 1A diode.
As a test, I temporarily installed a 3.5 A 12 volt sealed battery next to the existing battery; removed the CDI leads from the main battery, and connected them to the new battery.
The aircraft still will not start.
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CDI battery
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