I have an L235 which will not crank. Battery good, glow plug heats, but nothing happens when I turn key to start. I am wondering if it's the key switch. I ran out of daylight tonight, but I was going to try to clean all terminals. Will try that in the am. Does the key switch fail? There is still spring return. Anything else I should look into. I am new to this site so thanks in advance to anyone who can offer suggestions.