Posted by Janicholson on September 20, 2011 at 19:03:40 from (67.72.98.45):
For DavidG and those thinking of Neutral safety switches. This will be a description of a solution I think works. The front edge of the shifter lever bowl shaped weather protector that is spring loaded onto the tower top is a location that is usable to place a micro switch. A waterproof 20 amp roller actuated Noemally open switch positioned so that the lip of the bowl at the very front pushes the roller in when the shifter is in neutral. will work at any point left to right in neutral because the tilt moves but the edge does not. A 3/16" bracket would be sufficient to position it. When in any gear, the rim of the bowl will be either below, or above the roller, opening the contacts. This will work on any tractor with that style of lever/tower, and an horizontal neutral. To work on a farmall with the big push button start switch, a 3 terminal starter relay is used. The starter relay is placed between the big button switch, and the starter's cable terminal on the starter. The S terminal on the relay is connected to the microswitch, the other microswitch terminal is connected to the starter side terminal of the Big Button Switch. In action, the shifter is placed in N. The micro switch is closed. The ignition is on (or off!) The big button is pushed. This sends voltage to the relay, and to the microswitch then to the S terminal on the relay. The relay energizes and the starter is engauged.
If the system were used on a push or pull rod starter, the starter saddle switch would need to have an additional Micro switch placed on it to close when the rod is pushed or pulled. This microswitch would be placed in series with the shifter switch. to allow voltage to go to the added starter relay mentioned above. This would work (start) when ever the shifter was in N and the rod was pushed or pulled. Thus the saddle sw, and relay would both conduct, spinning the starter. Fun thinking if nothing else. Jim
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