When trying to start the tractor, I turn the key and nothing. I then fiddle around with the seat switch and sometimes it slowly builds up to turn over. At first it seemed like the battery was low, but eventually after continuously switching the ignition on and off and push on the brake it turnsover and starts. This has been happening since it was a year old. Now it's been two year since we bought the tractor and I've cleaned every contact that was involved in the ignition and still I have to fiddle with it before it starts. Is this common with the same tractor model or is my situation an isolated one?