How to Wire a Black & Decker MM850 Mower

Park and turn off the Black & Decker mower and open the hood over the Briggs & Stratton engine at the front of the vehicle.

Locate the rectangular battery at the front of the engine block. It is distinctive thanks to the red (positive) and black (negative) terminal wires extending from its sides. Use the red terminal wire as a guide and trace it back to the starter solenoid further back on the engine block. Ensure this wire is connected to the left-side bolt on the solenoid. If it is not, connect the end of the terminal wire to the solenoid's bolt by looping its open end over the bolt and tightening it into place with a socket wrench. Turn the bolt clockwise with the socket wrench to tighten the wire into place properly on the solenoid.

Look at the bolt on the left side of the solenoid, directly across from the connected terminal wire. There is a black wire here that should be secured to the bolt. This wire leads back to the starter motor and must be in place for successful Black & Decker mower operation upon ignition. Loop this wire onto the left-side bolt on the solenoid if it has come loose. Tighten it by turning its bolt clockwise with your wrench.

Look along the left side of the motor for the spark plug. A slender black ignition wire should connect to the back of the plug. Reinsert this wire into the back of the plug if it's come loose.

Find the Black & Decker mower's flywheel. This circular piece looks like a wheel with a bolted-down iron cover. Remove the bolts from the cover with your socket wrench and set the cover aside.

Look near the outer fins on the right side of the now exposed Black & Decker flywheel. There is a flap here that is part of the governor, which is used to regulate the engine's top speed. This flap should be connected to a bolt on the flywheel's side via its wire. Again, if the wire has come loose you must loop it back onto the bolt and tighten it into place with your socket wrench.

Set the iron cover back onto the flywheel using your wrench and the previously removed bolts.