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John Deere Tractors Discussion Forum
Show Parts for Model:

John Deere 50 , wire on distribtor side of ign coil

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pete 23

10-10-2013 19:31:03

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I'm working on a model 50 two cyl and it has a wire on the distributor side of the ign coil going to the ign switch switch, along with the wire going to the distributor. I checked a wiring diagram in Deere service manual and it shows that wire but I cannot find any explanation for it's purpose.

It is also shown on some of the other models of similar vintage but not all of them.

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Mike M

10-11-2013 05:42:57

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 Re: John Deere 50 , wire on distribtor side of ign coil in reply to pete 23, 10-10-2013 19:31:03  
In addition to what John T said. Not all of the 50 models originally had a by-pass starting system with the resistor. I think the parts book shows a serial number break,but it could of been rewired and added to any of them.

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55 50 Ron

10-12-2013 11:53:57

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 Re: John Deere 50 , wire on distribtor side of ign coil in reply to Mike M, 10-11-2013 05:42:57  
My 50 is a late one with the bypass starting wire and ballast resistor.

I have been known to forget to turn on the ignition switch, just hit the starter foot switch and it starts right up, but stops as soon as my foot comes off the switch. It doesn"t have the extra ground mentioned. Then it"s a quick glance and OH YAH I need to turn on the ignition switch!!!


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John T

10-11-2013 06:19:53

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 Re: John Deere 50 , wire on distribtor side of ign coil in reply to Mike M, 10-11-2013 05:42:57  
That's been my experience Mike, many were like the 520 (ballast and by pass circuit) others not why I added that disclaimer (moreso on 520). I guess if he has 4 wires (2 on each side) it must be wired like the later 520's. I've also seen different switches at vendor booths, the 20 series needs the MAG or GRND terminal for this purpose and that switch can also be used as a kill switch for a Mag ignition tractor as it provides a ground when OFF.

Were getting pretty detailed on this one but Ive seen this question raised before.

Fun chattin at ya

John T

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John T

10-10-2013 20:07:13

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 Re: John Deere 50 , wire on distribtor side of ign coil in reply to pete 23, 10-10-2013 19:31:03  

On some tractors of that vintage (but moreso on the 520 etc) there were not just one (to Dist) wire on the coils + lead to distributor, but two. The extra was to a MAG or GRND on the IGN switch on tractors that used a 6 volt coil and had the ballast by pass when starting system. That was so if the IGN was OFF the coil still didn't fire if the engine was cranked over, it was a safety feature. There were also two wires on the coils - input, one to IGN on IGN switch and the other to the starter switch which fed full battery voltage (unballasted) ONLY when cranking

Get it???????

John T

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pete 23

10-10-2013 21:02:40

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 Re: John Deere 50 , wire on distribtor side of ign coil in reply to John T, 10-10-2013 20:07:13  
Thank you for that information. That makes good sense,(but I didn't think of it).

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