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Garden Tractors Discussion Forum

B S spark - joe csuti

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Steve IA

06-14-2007 03:08:05




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Joe, read your suggestions several times and finally in the middle of the night, it struck me what you were trying so patiently to tell me. I've found and disconnected the kill wire. Now I have spark!!! This must mean the coil and trigger unit is OK, right? I'll be looking at the wiring harness, for shorts to ground and the ign switch. The safety switches kill the starter relay, not just the spark, so I think they are ok. I'll be back later. Thanks again.
Steve

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joe csuti

06-15-2007 12:59:13




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 Re: B S spark - joe csuti in reply to Steve IA, 06-14-2007 03:08:05  
Mower mfg is probably using sw terminal as a junction,for eng kill lead & seat safety sw for ign,if you were to remove wire from ign sw going back into harness & rear of tractor & reinstall kill lead to eng back on ign sw it would function same as sw you added,would kill ign when turned off,minus safety sw's in circuit to kill ign when eng running or trying to start & not sitting on seat.



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Steve IA

06-15-2007 13:42:21




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 Re: B S spark - joe csuti in reply to joe csuti, 06-15-2007 12:59:13  
Up and running again. Never did figure out exactly where the other wire went. Ended up cutting that wire and adding a toggle switch to the kill wire to get it to shut off with the key and the toggle switch. I know it's not 'correct',but the 20 yo mower is running again. And stopping. With all the fussin' around I broke the lead on the carburetor fuel solenoid and had to order a new one. OUCH! Thanks for all your help. Don't think I'd have ever gotten it running again without your and other's help.
Steve

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joe csuti

06-14-2007 19:01:42




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 Re: B S spark - joe csuti in reply to Steve IA, 06-14-2007 03:08:05  
As an after thought to 1st reply,after checking seat sw,IF you know which wire is kill lead going to eng on ign sw,disconnect wire from ign sw & reconnect kill lead at eng,crank eng & see if you have spark now,ign sw may be miswired or wrong type sw.



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joe csuti

06-14-2007 18:37:52




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 Re: B S spark - joe csuti in reply to Steve IA, 06-14-2007 03:08:05  
Glad to hear you now have spark on eng,problem probably in safety sw's on tractor,1st one I would go at is seat safety sw,most tractor safety circuits set up that you must be sitting on seat to start or run,if you get off seat in netural,drive engaged,or deck engaged ign is killed(grounded)seat sw is usually most troublesome of sw's,check for sw out of alignment with seat,sw loose in mount,wire connector loose or off sw,check sw with ohmmeter or powered test lite for bad contacts,if seat has forward/back or up/down adj,check that adj isn't causing seat to miss plunger on sw.Clutch/brake & mower engage or pto sw also effect ign on most tractors along with eng cranking circuit.

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Steve IA

06-15-2007 03:32:40




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 Re: B S spark - joe csuti in reply to joe csuti, 06-14-2007 18:37:52  
Joe, The seat switch has been bypassed for years, and the xmission and pto safety switches kill the starter not just the spark. I'll double check if they're tied into ignition, but don't think so at this time. The last 2 have idiot lights on the dash so I can tell why it won't turn over. I spent several hours yesterday tracking wires and testing the switch. Only one thing has me baffled. There is a 2nd wire on the spade prong with the kill wire where it plugs into the harness that goes to the switch and connects to the M on the switch which goes to ground only when the key switch is in the OFF position. This other wire goes down under the coweling, probably to the rear of the tractor with the battery and the safety switches, but I haven't been able to track it or find it's other end yet. Still looking though. Your second message gave me 2 ideas. 1st do as you say and disconnect the Kill wire at the switch and attach to the engine to test that. In all my testing I don't remember doing that one. 2nd reattach the kill wire at both ends and remove the extra unknown wire from the circuit and see what happens. I have been able to wire a 'kill switch' using a toggle switch and wiring it between the original kill wire and the engine. This allows me to toggle the kill wire to ground and kill the engine as needed. Any reason this would do any harm? I appreciate all your patience and help. I'll let you know how I come out, one way or the other. Thanks again.
Steve

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