k+s 1277 1 #1 Posted September 29, 2013 have no spark with new coil,any advice? looking for a service manual. tractor model # 73502-s/n 7901830. could anyone tell me where to find one?. have another 520 h with same problem.model# 73501-s/n.3900851 thankyou. Share this post Link to post Share on other sites
gwest_ca-(File Mod) 10,539 #2 Posted September 29, 2013 Onan engine service manual 1993 tractor manual 1997 tractor manual Garry 1 Share this post Link to post Share on other sites
Cable 179 #3 Posted September 30, 2013 (edited) Since you say there is a new coil we will assume for now that it is good and also assume that you have verified that 12 volts from the battery is getting to the coil when cranking the engine. What you need to do now is verify that the ignition module is working properly. Do this by connecting a voltmeter between the coil’s larger terminal and engine ground. Rotate the flywheel slowly and watch the volt meter change from 12 volts to a much lower voltage around 1 to 1.5 volts once for each revolution. Spark plugs can be removed to make turning the engine easier. Replace the module if you don't see this change. Edited September 30, 2013 by Cable 1 Share this post Link to post Share on other sites
k+s 1277 1 #4 Posted September 30, 2013 thankyou it should help me a lot. Share this post Link to post Share on other sites
