ahghra 0 #1 Posted March 30 520H. Onan engine. Changed oil/ filter. Install new battery. Started the engine, ran for a couple minuets and then stopped. Will not crank to restart. Oil light blinks. All dash lights light, but after turn key to start all lights go out except oil pressure. Starter does not attempt to crank. Share this post Link to post Share on other sites
nylyon-(Admin) 7,434 #2 Posted March 30 Don’t know much about the 520’s, but the for the 416’s the things that stop the starter would be PTO lever, and brake / clutch pedal. If both those are good, I would start checking to see if there is power to the starter relay when the key is turned, and work back from there. There’s electrical diagrams in the manuals section to help you. 2 Share this post Link to post Share on other sites
953 nut 57,499 #3 Posted March 30 @ahghra, not all 520s are wired alike so your model number (located under the seat) would be helpful. Once we have the model number we can provide a wiring diagram of every component between the battery and the starter and be more helpful in trouble shooting. In addition to the PTO and safety switches there could be problems with the "9 PIN" connector. Share this post Link to post Share on other sites
lynnmor 7,539 #4 Posted March 30 Download the Demystification Guide and find the starter circuit. 1 Share this post Link to post Share on other sites
Ed Kennell 40,252 #6 Posted March 30 Check the PTO switches and the wires connected to them. One of the wires may have been loosened while installing the new battery and vibrated off when the engine started. 2 Share this post Link to post Share on other sites
kpinnc 13,473 #7 Posted Monday at 05:05 AM 14 hours ago, ahghra said: All dash lights light, but after turn key to start all lights go out except oil pressure. I belive this is actually what you should see. The oil pressure switch sees no pressure when key is in the run position. My 520-H had quite a few electrical issues similar to what you describe, and the keyswitch itself was most of what was wrong. Might be a good place to start. For whatever reason, the 520 is very hard on them. Share this post Link to post Share on other sites
953 nut 57,499 #8 Posted Monday at 12:03 PM 20 hours ago, 953 nut said: not all 520s are wired alike so your model number (located under the seat) Share this post Link to post Share on other sites
ahghra 0 #9 Posted Wednesday at 04:21 PM Thanks for replies guys. Will ck out all suggestions. If no luck will post model etc. numbers. Share this post Link to post Share on other sites
