Thanks, I'll slip the belt off and try that, the revs drop then it dies. The mower belt moves by hand so figured it wasn't too tight. I've tried uploading pics but it says files are too big. ?If the engine stop dead like you have turned off the mower when you turn the blades on then you have an electrical problem.
If it stops dead like you kit a brick wall then you have a deck problem.
Slip the belt off the engine then try again.
Motor keeps on running then the deck needs a look at
Motor stops the same then the electrics need attention.
Not sure what a 7180 actually is so a photo or two would not go astray.