I have a 4630 Ford/New Holland that suddenly wont start. If I crank it over it starts but when I release the starter key it dies. I replace the starter switch, and checked all fuses with an ohlm meter. In the start but not crank position I have no power to the fuel solinoid. If I move one of the wires on the starter to the aux. position it will start however it only starts after I release it from the crank position to the on position. Is there a hidden relay somewhere.