deer_remington 2 #1 Posted October 26, 2014 Just got a new to me 1990 520H that is an electrical mess and would not start. The fuse block and 9 pin molex connector were a mess. Replaced the fuse block with in line fuses and replaced the 9 pin molex with individual sealed male/female plugs. Also have replaced the neutral safety switch, the parking brake switch, both switches at the PTO lever and the seat switch. Now it will start with the motion lever in neutral and the PTO engaged. Will not start with the PTO lever disengaged. Any ideas? This thing is driving me nuts. Any help would be greatly appreciated. Thanks Share this post Link to post Share on other sites
JustinW.73 224 #2 Posted October 26, 2014 sounds like it was wired wrong. Try disconnecting the wires that go to the pto safety switch Share this post Link to post Share on other sites
deer_remington 2 #3 Posted October 26, 2014 Thanks for the reply but I verified the wiring with the wiring diagram in the manuals section. The pto has 2 switches ( one stacked on top of another). Will it crank without the wires plugged up to these switches? Share this post Link to post Share on other sites
JustinW.73 224 #4 Posted October 26, 2014 (edited) Well the way it sounds it is wired reverse, so it you unplug the wire to the switch, it would work with the pto off. But maybe im wrong. If this doesn't work, then when you get some spar time, I would go on the wiring diagram file:///home/chronos/u-ddbd8e78c9213fee29a844fd45c6ad010cfee30b/Downloads/810619R1%201990%20520-H%20OM.pdf And check every single wire. Edited October 27, 2014 by JustinW.73 Share this post Link to post Share on other sites
Geno 1,928 #5 Posted October 27, 2014 I think one switch goes through the seat switch. Share this post Link to post Share on other sites
JustinW.73 224 #6 Posted October 27, 2014 I think one switch goes through the seat switch. Ya that sounds right. Share this post Link to post Share on other sites