John Deere Starting Improvement Relay Kit - AM107421

Part Number: AM107421
63 Review(s)
John Deere Starting Improvement Relay Kit - AM107421
John Deere Starting Improvement Relay Kit - AM107421
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Your Price: $72.27
John Deere Starting Improvement Relay Kit - AM107421
Usually available
Brand John Deere


John Deere kit to improve starting on some John Deere machines. Kit includes harness, relay, hardware and instructions.This kit is designed to eliminate voltage drop between battery and starter solenoid.
Click here to read John Deere service bulletin
Fits models:
  • 316 Onan
  • 318
  • 420
  • F910
  • F930

All Kawasaki 100 series tractors EXCEPT 9 hp 130 tractors including:

  • 160
  • 165
  • 170
  • 175
  • 180
  • 185

All Kawasaki rear engine riders EXCEPT 9 hp engine models including

  • GX75
  • GX95
  • RX75
  • RX95
  • SX75
  • SX95
  • SRX75
  • SRX95

To view the installation instructions click here.


  • California use info:

    ⚠ Warning: Cancer and Reproductive Harm -

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Customer Reviews

Starter Improvement Relay Kit
I have been borrowing my neighbor's JD riding mower for a few years. He has had a problem with the starter for as long as I can remember. He was positive it needed a new starter but was hesitant on where to take it. So I got my husband, the mechanic, involved. Turns out a friend of ours had a JD repair business and told us what the problem was. I ordered the part from you; my husband installed it; it starts every time and my neighbor is thrilled!! Thank you so much for your help. If he needs anything else, I will be sure to contact your company again. Maintenance on his mower is the least I can do for him allowing me to use it.
Did you find this helpful?  18 of 19 Found Helpful
Reviewed by:  from Baltimore, MD. on 10/13/2012
This kit solved all my poor starting problems! As most tractors have safety switches in various locations, as time increases the resistance through the switches also does. This results in less than optimal voltage reaching the starter. This kit eliminates the problem. It also fits most compact Kubota's (such as my B2400 3 cyl. diesel), although this is not very well publicized.
Did you find this helpful?  13 of 13 Found Helpful
Reviewed by:  from Western NY. on 12/21/2016
Relay Kit
I should have bought one of these, years ago. Starter engages, first time everytime.
Did you find this helpful?  12 of 14 Found Helpful
Reviewed by:  from Michigan. on 12/11/2012
Easy install on John Deere 650 (1986). Insufficient voltage at starter due to deteriorated coil. This unit provided a bypass without compromising any safety switches. Weak coil then neutral safety switches on wire to starter. Voltage is sufficient to enable new coil and draws power for starter from starter terminal.
Did you find this helpful?  8 of 10 Found Helpful
Reviewed by:  from Pittston PA. on 8/23/2015
Works great!
I have a friend who sometimes couldn't get her STX38 to turn over. This kit solved the issue and it starts right up every time now!
Did you find this helpful?  7 of 8 Found Helpful
Reviewed by:  from Coventry. on 5/11/2014
No more starting problems!
This was easy to install on my ORANGE tractor (Kubota B2400) and wow what a difference, very noticeable especially if left outside in the cold for awhile. This is a five star part for sure and Green Parts Store was rock solid too. Easy order and at my door in no time!
Did you find this helpful?  7 of 8 Found Helpful
Reviewed by:  from Michigan. on 1/9/2013
Great fix for an old mower!
I wish I would have found this years ago!!! It instantly solved the starting problem on our John Deere 160 lawn mower.
Did you find this helpful?  7 of 8 Found Helpful
Reviewed by:  from Sunman, IN. on 10/28/2012
I have been beating on the starter for over 15years to get my 160 cranked. Not any more works everytime!!
Did you find this helpful?  6 of 7 Found Helpful
Reviewed by:  from Jacksonville. on 7/31/2016
too grumpy
Fantastic, totally fixed my starting problem on the 180.
Did you find this helpful?  5 of 5 Found Helpful
Reviewed by:  from Clifton, VA. on 5/25/2013
I echo these reviews. I was about ready to buy a new mower, but this kit solved a years old proble. Price very reasonable, and shipping very fast. Thanks GreenPartStore!!
Did you find this helpful?  4 of 5 Found Helpful
Reviewed by:  from Gorham, ME. on 5/14/2013
JD starting improvement relay kit
The kit arrived promptly and it is already installed on my tractor. What a relief to turn the key and have the engine immediately turn over and start. No starting problems now. Thank you so much for making this kit available; and at a reasonable price. JIM
Did you find this helpful?  4 of 6 Found Helpful
Reviewed by:  from Nebraska. on 3/20/2013
Thought the starter motor on my old LX172 was in its final year--click, click, click almost every start-up. Started to order a new one when I read about this relay kit. I ordered it, installed it in less than 30 minutes, and now the old Deere starts right up.
Did you find this helpful?  3 of 3 Found Helpful
Reviewed by:  from Virginia. on 9/17/2015

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