BlazNT
Lawn Pro
The solenoid is USUALLY, a part of the mower itself, supplied from the manufacturer, so, now we need the mower model number (usually found under the seat,) most likely, if you've been using a 3 pole solenoid, that's all it needs.
I am not disagreeing with Boo I am just letting you know what I do. I replace all 3 pole solenoid with 4 pole and make a ground wire and hook it up. I find it the more reliable form of a ground.


