Mr. Knoop 5 #1 Posted June 12, 2023 Hey guys Ive got an issue with my 96 520H blowing the 15amp fuse furthest to the front of the tractor when my headlights are turned on. Im not sure where to start and hoping some pros can help me dial down my search area. Everything is stock on my tractor. Thanks a bunch. Share this post Link to post Share on other sites
lynnmor 7,559 #2 Posted June 12, 2023 Download the Demystification Guide and it will show the individual circuits. There is a green wire that goes thru the 9 pin engine connector that carries the headlight current, trace it both ways looking for a short. 2 Share this post Link to post Share on other sites
ri702bill 8,967 #3 Posted June 12, 2023 Not owning a 520 - but it has a tilt hood like a C series that I do have. Look for wire chafing - most likely the power to the lights wire - if if got pinched it could be grounding out... One other spot is the switch itself. disconnect the harness, look for continuity to grond with it both on and off.... 2 Share this post Link to post Share on other sites
WHX?? 50,712 #4 Posted June 12, 2023 Start at the taillights. A few things back there that can cause chafing. 1 1 Share this post Link to post Share on other sites
ri702bill 8,967 #5 Posted June 12, 2023 Just now, lynnmor said: There is a green wire that goes thru the 9 pin engine connector that carries the headlight current THAT connector is a known source of electrical issues on the newer tractors.... 2 Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,243 #6 Posted June 12, 2023 Download this file. Pages 7-103 and 7-104 show what the 15 amp fuse powers on the pink wires.. If it blows when the headlamps are turned on the problem is between the headlamp switch and the headlamps or tail lamps 3 Share this post Link to post Share on other sites
lynnmor 7,559 #7 Posted June 12, 2023 Just now, ri702bill said: THAT connector is a known source of electrical issues on the newer tractors.... Sure is, it belongs in a radio not a tractor. The major issue is the high charging current going thru unplated terminals and getting hot. That can be helped by running a fused bypass wire directly to the battery terminal of the solenoid. 1 Share this post Link to post Share on other sites
squonk 42,522 #8 Posted June 12, 2023 You can even start by unplugging the bulbs. They can short when a filament breaks. Seen it more than once. 4 Share this post Link to post Share on other sites
Mr. Knoop 5 #9 Posted June 12, 2023 Thanks so much crew! I appreciate it. 1 Share this post Link to post Share on other sites
