John deere 4.5 throttle problem

[case9030b]

I have a morbark wood chipper with a 4.5l John Deere engine 143hp that has a toggle swith to lift/decrease the engine revs,It stopped working the other day and would only idle.Swapped the toggle button for a new one and did nothing it has 2 wires running to the button down to the ECM.

anyone had experiences with this type of thing it has me beat!

 

[willie59]

I don't know what inputs the ECM would require to change speeds 9050B. It could be voltage input, could be ground input. If you don't get any info, the best I could advise is trace the wiring that works your toggle switch, see if it's a positive voltage circuit or a ground circuit. It may be it's a positive circuit and it's not getting power. I hope you get it sorted out.

 

[case9030b]

Well it ended up being the switch that was a no brainer,But a resistor in the circuit box was blown it had power going to the switch just none getting to the ECM

 

[willie59]

Well, good to hear ya got it sorted out. And it didn't empty your wallet.