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I'm new here, but I have years and miles of dealing with electrical issues with my 1997 416H, engine Onan P216G (I am the only owner) . Problem description: the start circuit turns the starter over fine, but no spark at the plugs or the coil sockets by spark tester. The ignition trigger tests good by connecting a test light to the coil positive and and the ignition trigger negative lead, plenty of light flash from the test light in unison with the engine turning over. So, I conclude the ignition trigger, replaced 3/18/2021 along with the coil is good. I have followed the "Demystification" wiring diagram in detail and there is 12V at the coil positive terminal, wiriing is solid (for now), all those damn safety switches, key switch, and relays work too. I conclude that the coil is bad since the primary side tests 3.1 OHM and the secondary tests infinite OHMS (1. displayed on multimeter). Two coils (Onan part# 166-0820) have NEW dates of 3/2021 and 8/2021, and yes both have the same test results mentioned. Infinite OHMs to me means the coil windings are broken. The most recent coil came from Onanparts.com and tested as mentioned above when it arrived. Onanparts won't take anything back! There are a lot of coils on ebay and various suppliers from China. Maybe good, maybe bad, who can tell? And most suppliers won't accept returned electrical parts. Please help: What are good test readings for a GOOD coil (primary and secondary). Who do you recommend as a reliable supplier for a new coil? Thanks for any help! Rollo416H
