Yesterday's Tractor Co.
Shop Now View Cart
   Allis Chalmers Case Farmall IH Ford 9N,2N,8N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   Traditional YT Forum ViewClassic View   RegisterRegister 
 ProfileProfile    Log inLog in 


Post new topic    
View previous topic :: View next topic  
Author Message
Long Time User

Joined: 09 Jul 2003
Posts: 577

Report to Moderator

PostPosted: Thu Nov 15, 2012 10:19 am    Post subject: 4020 LP PERTRONIX IGN TROUBLESHOOT Reply to specific post Reply with quote

Just put the kit on a 1970 model and am having problems. Is there a resistor somewhere? Voltmeter says there is 11.8V to the coil with the key on. Tractor will fire while engaging the starter but dies as soon as key is released. Someone told me to run a jumper wire to the coil? Or to the Pertronix red wire?
Back to top
View user's profile

Report to Moderator

PostPosted: Thu Nov 15, 2012 1:53 pm    Post subject: Re: 4020 LP PERTRONIX IGN TROUBLESHOOT Reply to specific post Reply with quote

I installed one of those ignitors on a 4010. Not sure if a late model 4020 gas is similar. A 4010 used a 6 volt coil and was 12 volt positive ground. There is a resistor on the ignition switch that drops the voltage to the coil to around 6 volts when the key is in the run position. When the key is in the start position this resistor is bypassed and 12 volts is at the 6 volt coil to make a hotter spark while cranking. Easier starting was the idea behind this. I removed the resistor and used a bolt for a jumper so there is 12 volts at the coil when cranking and running. Also used a 12 volt coil. This may be why yours dies when the key is released to the run position if you changed the coil to a 12 volt. There are others on here that know a lot more than I do but this may get you headed in the right direction. Also that was the best improvement I've made on that tractor besides switching to a Zenith carb. You won't be disappointed after you get it lined out. Be sure and check the timing also.
Back to top
John T
Tractor Guru

Joined: 14 Dec 1998
Posts: 17775

Report to Moderator

PostPosted: Thu Nov 15, 2012 5:54 pm    Post subject: Re: 4020 LP PERTRONIX IGN TROUBLESHOOT Reply to specific post Reply with quote

Im not familiar with New Generation but if the tractor uses a 6 volt coil and has a series ballast resistor and a working ballast by pass if the elec switch is working and conducting current (like if it had points and they were closed) with the Ign on Id expect to see around 6 volts on the coils input and 0 on its output (To distributor). If youre seeing 12 on the coils input with the ign on look n see what the voltage is on the coils output (to distributor) ??? If its also 12 n stays there the switch isnt closing and conducting coil current as it should normally, its ONLY when it opens the coil fires. A test lamp on the coils output should flash on (switch open) and off (switch closed) if the tractor is cranking over. This assumes its all wired correctly and if it has a ballast its good and NOT bad/open.

John T
Back to top
View user's profile
Display posts from previous:   
Post new topic    Yesterday's Tractors Forum Index -> John Deere All times are GMT - 8 Hours
Page 1 of 1

Jump to:  

Fast Shipping!  Most of our stocked parts ship within 24 hours (M-Th). Expedited shipping available, just call! Most prices for parts and manuals are below our competitors. Compare our super low shipping rates! We have the parts you need to repair your tractor. We are a company you can trust and have generous return policies. Shop Online Today or call our friendly sales staff toll free (800) 853-2651. [ About Us ]

YT Home  |  Forums

Modern View Forum powered by phpBB © 2001, 2005 phpBB Group

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters