I recently acquired a Snapper model SR1030 riding mower (10 HP Briggs & Stratton motor). The first time I tried to start it, I moved the engine speed lever to choke 3 times and it started right up. It ran for about 20 minutes and then just died. I tried to start it, but it wouldn't even turn over. Absolutely nothing. I found that I had forgot to unscrew the fuel vent before beginning to cut my lawn. I opening it up. Still, nothing. After a good while of troubleshooting using the electrical schematic, I discovered an open fuse (in the line from ignition to the starter solenoid). Replaced this fuse. Still nothing at all. I decided to rule out a faulty battery (which is about 4 years old) by connecting my car battery to the mower's battery. Now, I finally got 12 Volts to the starter, but the motor still won't start/run. I noticed that the pedal/clutch switch was not being pressed in when the clutch pedal was depressed. I re-positioned this switch so that it is being depressed with the clutch pedal. I exercised the choke the exact same way that I did when it did start for me. Still won't start/run. I check all of the safety switches which are good. I pulled the safety interlock module. There was a lot of dust & dirt, which I cleaned off. I plugged it back in and tried it, but there was no change. I pulled the safety interlock module again and checked it with my Ohmmeter. Two of the four terminals are shorted together. I don't think that this is normal, unless the module contains a relay. Does it sound like the safety interlock module may be faulty or would I not get voltage to the starter at all if that was the case? If so, do you know of a good online source for them? Thanks for your help!