I have a starter solenoid go bad on a Ford F700, 1989 model.So I got another one for it.
I decided to check the coil resistance, to compare it with the old one. Both were around 4 Ohm. But it turned out, in the new solenoid, the internal coil was connected completely differently from the old one.
Both solenoids are nearly identical on the outside, except one is white, and another is black. Both are 4-terminal solenoids, with the “S” and “I” terminals clearly marked.
The old solenoid had the internal coil connected to the “S” terminal and the ground bracket, which I assumed was how all Ford solenoids would be wired.
However, in the new one, the internal coil is connected between the “S” and the “I” terminals.
Are there two types of solenoids?