Pat Marchwick 91 #1 Posted April 27, 2021 (edited) I have a 520h that has no spark. I trouble shot per another helpfull posting and with a meter found out my coil was bad. No ohms as the posting said I should have. I ordered and received a aftermarket coil for $30.00 and tested it with the ohm meter and it was at 3.2 ohms of resistance. I installed it and was thinking it would fire right up and have bragging rights for the smart repair. Nothing happened. I tested the coil again and it now reads zero. Did I buy a weak coil or is there a way that a coil can be damaged that fast? thanks for the help Edited April 27, 2021 by Pat Marchwick Spelling Share this post Link to post Share on other sites
lynnmor 7,710 #2 Posted April 27, 2021 You bought a cheap Chinese coil so that could be a problem. I wonder if the engine wiring was played with and you are getting AC voltage to the ignition system. Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,390 #3 Posted April 27, 2021 Is the condenser connected to the coil (+) terminal? That is not normally what we see but that is how the Onan Twins are wired. (Engines with points have the condenser connected to the (-) coil wire to protect the points) The condenser must be mounted to a grounded surface to complete the circuit and is there to absorb voltage spikes in the battery power supply. Garry 1 Share this post Link to post Share on other sites
Pat Marchwick 91 #4 Posted April 27, 2021 Yes the condenser was wired to the positive terminal and attached to the tin bar that the air cleaner base gets bolted to. Share this post Link to post Share on other sites
