pfrederi 17,741 #1 Posted July 5, 2021 Neighbor dragged over his 856 just "turned off" while he was mowing. S/G spins the engine nicely spark plug tester shows nothing. Check voltage at coil + 12.4 put test light on coil (-) and cranked...light flashed on and off. Replaced Spark plug with new one an put on a different coil to plug wire still NADA.. Resistance across coil primaries 2.5 ohms (sightly low??) Secondary about 13.5k ohms (a bit high?). Disconnect condenser still no spark...??? What am i missing??? 1 Share this post Link to post Share on other sites
SylvanLakeWH 25,605 #2 Posted July 5, 2021 Safety switches? 1 Share this post Link to post Share on other sites
cafoose 3,355 #3 Posted July 5, 2021 Compression? point gap? 1 Share this post Link to post Share on other sites
squonk 41,164 #4 Posted July 5, 2021 (edited) Throw a coil on it Paul. Even with pretty good readings, Maybe the coil is shorted to ground internally. Electricity will flow to ground thru the least possible resistance. A winding could be leaking to the case and still give good readings. Edited July 5, 2021 by squonk 3 Share this post Link to post Share on other sites
pfrederi 17,741 #5 Posted July 5, 2021 (edited) 10 minutes ago, squonk said: Throw a coil on it Paul. Even with pretty good readings, Maybe the coil is shorted to ground internally. Electricity will flow to ground thru the least possible resistance. A winding could be leaking to the case and still give good readings. Winner Winner chicken dinner... After I posted i started swapping things back an forth with my Commando 8. put the dead tractor coil on my Commando 8 and suddenly she was dead. put the commando 8 coil on the 856 and spark... Thank you Mike and all.... Edited July 5, 2021 by pfrederi 1 4 Share this post Link to post Share on other sites
stevasaurus 22,765 #6 Posted July 5, 2021 No safety switches on that old of a horse. I was thinking coil...only reason they quit while you are in the field. Squonk, knew you were going to say that. 1 1 Share this post Link to post Share on other sites
squonk 41,164 #8 Posted July 5, 2021 July 5th. The month has barely started. I've had my brainstorm for the month. Now what do I do for the next 26 days? 1 2 Share this post Link to post Share on other sites
pfrederi 17,741 #9 Posted July 5, 2021 (edited) 27 minutes ago, stevasaurus said: No safety switches on that old of a horse. I was thinking coil...only reason they quit while you are in the field. Squonk, knew you were going to say that. I had a condenser die in the field on one of my big tractors. Real PIA took awhile to figure that out had to work in the field... WHs are easier.... Edited July 5, 2021 by pfrederi 2 Share this post Link to post Share on other sites
stevasaurus 22,765 #10 Posted July 5, 2021 I had the bad coil thing happen on my 857...about as far away as you could get from the barn. Share this post Link to post Share on other sites
squonk 41,164 #11 Posted July 5, 2021 (edited) Had one of those old Dodge Rampages shut off on me one night about 8 miles from home. Luckily I had a spare pick up coil in the glove box. Edited July 5, 2021 by squonk 1 Share this post Link to post Share on other sites
squonk 41,164 #12 Posted July 5, 2021 Had a 704 shut off mid mow. Kill wire caught the steering shaft and wound itself around until it grounded out. 1 1 Share this post Link to post Share on other sites
SylvanLakeWH 25,605 #13 Posted July 5, 2021 1 hour ago, stevasaurus said: No safety switches on that old of a horse. Duh-oh… 1 1 Share this post Link to post Share on other sites
Handy Don 12,241 #14 Posted July 5, 2021 2 hours ago, squonk said: Had one of those old Dodge Rampages shut off on me one night about 8 miles from home. Luckily I had a spare pick up coil in the glove box. What? Really? And the tools to make the swap were in there too? Amazing. Share this post Link to post Share on other sites
squonk 41,164 #15 Posted July 5, 2021 20 minutes ago, Handy Don said: What? Really? And the tools to make the swap were in there too? Amazing. All that was needed was a Phillips screwdriver. Share this post Link to post Share on other sites
