753 ( older model w/ control switch in key/light cluster) maybe 1/3 of the time I get strained start or no start because the auxiliary pump come on?

[RogerWayne]

1st post so guess it'll show, anyway auxiliary switch has been surrounded by a mouse nest enough the urine or what ever they do in there has compromised the switch's function,IMO. The light's feeds from the control board inside the switch have rotted off so the light don't work (not so much the problem) but on start up about 1/3 of the time the auxiliary pump gets auto engaged . I removed the switch and it seemed the green and red wire when jumped would control the pump so I thought I had it sorted out ,just turn it off and leave the switch out and get a new one. Went I to move the skidder a bit ago, w/o the switch in, the pump was on again, Any tips?