John G. wrote- >You'll want it right for flight, but you don't have to have it connected for >an engine test run.
Glad to hear that, since I'm close to test-running an 1835 that employs a lawn tractor dynamo to charge the battery through a voltage regulator/rectifier and I don't want to mess with the wiring for the alternator and regulator for test runs. I connected the two leads from the dynamo to the regulator and also connected the ground from the regulator's finned cast metal body to the common grounding point on the firewall in case the regulator dumps excess energy from the dynamo to ground. I have no idea what the inside of the regulator/rectifier circuitry looks like since it's potted. The ignition will operate as a total-loss system with just the battery connected for test runs. My source (Mark Langford's N56ML.com website, instrument panel page) says that a points ignition pulls roughly 1A per 1000 RPM, so at rated max speed of 3400 RPM, the ignition should be pulling about 3.4A so even a little 9Ah UPS battery should power the ignition for a couple of hours at full tilt. Oscar Zuniga Medford, OR
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