This hopefully takes some of the mystery out of testing the interlock / safety circuit on Toro snowblowers starting around the 1981 model year.
You shouldn't hook-up a voltmeter to the interlock modules...it could burn-out the internal circuits.
Tools you'll need:
- Spark tester
- 2 jumper clips
- continuity meter (for the interlock circuit only...not the interlock circuit itself)
If the module itself fails, good luck finding one; they're NLA.
If the module passes however the interlock circuit (consisting of harness, handlebar switches, auger limit switch, gear-select limit switch) has bad continuity. Start by cleaning all of the connections and testing individual components. Use dielectric grease on the contacts to preserve them for years to come!
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