Jeff1129 108 #1 Posted June 30, 2021 My 520 hc lost all power when i went to put it away washing it i started it up to put it away halfway there it died as if i turn it off as i go to start it wasn't turning and there were no dash lights so i dont know what's happening thanks Jeff Share this post Link to post Share on other sites
lynnmor 7,710 #3 Posted June 30, 2021 The first place to look is the 9 pin engine connector near the battery, they frequently fail. I don't think you have a fuse block, the fuses are in several locations. Another possibility is the ignition switch or the plug connecting it. Go to the manuals section and download the Demystification Guide, the Owners Manual, other information there and the Onan Service manual. These are invaluable when troubleshooting electrical issues. After you reviewed the information and still need help, return with the exact model number and year. Photos of the entire tractor and possible trouble areas can be a big help. 1 Share this post Link to post Share on other sites
pfrederi 18,558 #4 Posted June 30, 2021 1 hour ago, Jeff1129 said: My 520 hc lost all power when i went to put it away washing it i started it up to put it away halfway there it died as if i turn it off as i go to start it wasn't turning and there were no dash lights so i dont know what's happening thanks Jeff Water an electrical do not mix well especially 520 series....Compressed air hair dryer or time and it may work again. But you will have to look at corrosion in various connectors. 1 2 Share this post Link to post Share on other sites
roadapples 6,983 #5 Posted July 1, 2021 Use dielectric grease on all electric connections... 1 Share this post Link to post Share on other sites
peter lena 9,189 #7 Posted July 1, 2021 @Jeff1129, agree with @lynnmor on the multiple connection issue , often those connections are stress cracked and create a multiple electrical shut down , having replaced a few of the connection blocks , take the time to detail the wiring layout , no stress or wire pulling areas , use a " wire wrap " covering to protect your layout . also dielectric grease every connection . would also , add a ground from engine corner / block area , to battery ground rail behind dash , for increased conductivity . look for electrical " streaking " marks on those multiple connectors , verify every gain and build on that , pete 1 Share this post Link to post Share on other sites
