You might review this to see what type solenoid you need from NAPA. (for a mower)
http://www.arcomarine.com/xhtml/Tech%20 ... esting.pdfThe isolated base type with two terminals (used with interlock circuits) can be made to replace the grounded base type but not vice versa.
and you probably know this: some of these type solenoids do not come new with double nuts on the control screws. the single nut on the terminal is locking the terminal to the body of the solenoid to prevent from twisting the terminal. If the terminal screw twists (turns) it breaks the little solenoid coil wire internally. I do not use nut drivers when installing or removing wires from these screws, use a open end or box end so you can carefully WATCH THE TERMINAL SCREW because sometimes you may have to use a backup wrench on the inside nut to prevent twisting the terminal and ruining the solenoid.
A guy brought me 3 new ones to test that he had ruined and had a fourth in his hand that he had not installed yet. He was trying to install them using the one screw on the terminal to hold a ring lug and the terminals were twisting breaking the small solid wire inside. Some of these terminals use a push on friction fit connector (which is good) instead of ring lugs so as the small nut can be left in place
The one in the picture posted has two screws on the control terminal nut.