Lawn Mower Charging Solved. Maybe it helps someone...

So my lawnmower had not been charging the battery. After a few cuts voltage drops and the electric clutch won't hold and blades drop out.

Finally got to looking at it. Voltage out of the rectifier was low.... I replaced it. Still the same issue. Turns out it has to see battery voltage to initiate the charging voltage going out.

I started ohming out wiring and found the wire to the switch after wiggling the fuse to have way too high a resistance value intermittently.

Come to find out the switches that are common on a bunch of these machines can corrode or delaminate enough to drop out the voltage back when key is on to signal the voltage regulator to put out.

This machine is washed and cared for and stored inside and the switch still looked like shite and separated.

New switch was $16. The voltage regulator was $52. I kept the old as a spare.