John Deere 4020 Diesel Serial #201,000 & Up Battery to Battery Jumper Cable - The Brillman Company
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new battery box for a john Deere 4020 - YouTube
Amazon.com: Complete Tractor 1400-0402 Battery Cable Compatible with/Replacement for John Deere 4020, 500 Indust/Const AR28950 : Automotive
Battery Cable - 17" - Red fits John Deere 4630 3020 4230 4020 4430 4000 8430 | eBay
John Deere 4020 Diesel Row Crop (Serial #250,001 & Up) Positive Battery Cable - The Brillman Company
John Deere 3010, 3020, 4010, 4020 Diesel Positive Battery Cable (12-Volt Alternator) - The Brillman Company
Amazon.com: All States Ag Parts Parts A.S.A.P. Battery Box - Left Hand fits John Deere 2510 3010 3020 4320 4010 4000 4620 4520 4020 2520 500 500A AR40208 : Patio, Lawn & Garden