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post #1 of 1 Old 10-05-2018, 09:47 AM Thread Starter
Join Date: Oct 2018
Location: Pennsylvania
Posts: 3
JD 455 Electrical Issue - Low Voltage/Key Switch Board

Hi guys,

New to posting but have used this board many times to fix issues with my 1999 JD 455.

I'm currently diagnosing an electrical issues that seems to be related to my key switch and board, but could be something else as well.

Tractor ran normal then seemingly out of nowhere when trying to start, dash lights come on, go off, then dead. Turn key off, then back on, nothing, no dash lights, nothing.

Replaced key switch and board with correct module for my later model year, problem solved. After about 4 cuts, same thing, when trying to start, dash lights on as normal, solenoid fires as normal, then at some point before firing up it dies.

Replaced key switch and board again, fires right up. About 4 cuts later...yep, you guessed it, died again...and that's where I stand today.

Now, I did some more digging using my tech manual and found that my battery is good (12.8V) and good power all the way through the key switch board (control/fuse module) to terminals 2 and 6 without the next wiring harness attached (i.e., fuses good, key switch good). But when I connect the power connector harness to the control/fuse module (X1) the voltage across the system drops way down to about 3.8-4.0V then slowly climbs to about 6V after minutes of sitting there. My dash lights glow dim and a bit brighter but obviously not enough voltage to do start the tractor.

Anyway, could this be a short in the wires after the key switch board? A blown board (again?) or what?

Any help is much appreciated!

bthoffman is offline  
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