I recently bought a snowmobile with questionable electronics and a dead battery installed this along with a batter. Within a matter of less than 2 weeks the starter solenoid welded itself shut and because of this little part I was able to shut off the electrical before I ruined my wiring harness any further great product would recommend greatly as it is also waterproof. (The battery on the sled takes a good 15 minutes to dig out from under electronics and the air box)