1990Onan520-H 15 #1 Posted April 27, 2019 Its located on the left side under the hood. I just noticed the wires that go to it are disconnected for some reason on my 88 520-H. Share this post Link to post Share on other sites
JCM 8,616 #2 Posted April 27, 2019 Looks like the Air Cleaner Sensor. 2 1 Share this post Link to post Share on other sites
gwest_ca-(File Mod) 10,482 #3 Posted April 27, 2019 Click on the picture Garry 1 1 Share this post Link to post Share on other sites
lynnmor 6,762 #4 Posted April 28, 2019 (edited) I bought from these folks several years ago, don't know if they still sell just a few, Source Part number was: psf101-8111-150 I have repaired a few by making a plate with a nipple to cover the bad side. Edited April 28, 2019 by lynnmor Share this post Link to post Share on other sites
The Tuul Crib 7,332 #5 Posted May 5, 2019 Looks like a safety switch Share this post Link to post Share on other sites
