Small Engines (Lawn Mowers, etc.): Ariens snowblower interlocks, safety switches, drive tractor

Question
I have an Ariens 924038 snow blower and traced a no spark problem to the electrical interlock inside of the drive tractor, the switch tested good do you know what the 524010 part is suppose to do and how to test it before buying it for $60?

Answer
The module is basiclly a relay that grounds the ignition when any of the safety switches are in the wrong position.  The wiring differs depending on engine and other variables. If the engine will start and run with the interlock disconnected then the problem is obviously a bad interlock.

I have never found solid information on how to test these or Snapper modules...the manual says to check the other safety switches and the ingnition coil...if they are all good then the module much be bad.  Not really helpful in my opinion.  I've tried cutting open the modules but this is next to impossible.

Have you removed the engine shroud and dis-connected the small wire from the coil and checked for spark?

Let me know if you have spark with the small wire on the ignition coil dis-connected.

Eric