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John Deere Tractors Discussion Forum
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elctronic ignition problems

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bassndeere

09-24-2006 18:30:08




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My 70LP suddenly got hard to start, seems to be flooding. Checked spark at plugs, very weak. 12.51 volts to distributor, coil show to be good, magnets seem good inside distributor. Any idea's on how to check the electronic module? Thank you




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bassndeere

09-25-2006 17:57:34




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 Re: elctronic ignition problems in reply to bassndeere, 09-24-2006 18:30:08  
Thanks for all the tips. Used a test light to check the module, it showed good. Checked coil with meter to get resitance, shows to be good. Spark still very weak. Had battery checked under load, it showed good. Pulled starter and battery cable. Took it in for a rebuild. Maybe it is robbing voltage? Thanks again for all the help.
Don



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Bob

09-24-2006 20:54:28




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 Re: elctronic ignition problems in reply to bassndeere, 09-24-2006 18:30:08  
Pertronix module, I assume?

If you have spark at all, it's most likely NOT NOT the module.

Their "failure mode" is usually NO spark at all. Sounds like a voltage supply, coil or cap/rotor problem.



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John T

09-24-2006 18:46:16




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 Re: elctronic ignition problems in reply to bassndeere, 09-24-2006 18:30:08  
Bass, the low side of the coil (other side from one that gets voltage from switch) ought to normally be at ZERO volts (tied to ground via elec switch) so the coil can conduct current,,,,, , but only when a rotor magnet tip passes by the pickup coil (like when high cam lobe used to open points) it should read near battery voltage cuz the elec switch then n only then ought to open. A test lamp on the coils low side ought to flash on (switch open) n off (switch closed) as the distributors rotor turns and the magnet tip passes by the pickup coil.

If the light stays on even as the magnets pass by the pickup coil, Id say the elec switch is bad (never closes). If the light is always offfff, again Id say the switch is bad/shorted or else the coils primary winding is open.

Any help??? You gotta have voltage on the coils high input (from switch) terminal when ignition is on but the coils other side has to conduct current (switch closed) then interrupt it (switch open) to fire the coil.

John T

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