Volvo Penta replacement solenoid 872826. Internally switched, two wires only. Can be easily wired as 3 wire by adding one wire to the switch plate or using your 3 wire pigtail.
This solenoid has two coils. It also has an internal switch that disconnects the stronger coil once the solenoid is engaged. This allows a single wire setup using a mechanical double contact switch that is mounted on the rear of the solenoid to turn off the pull coil. Internally switched solenoids are best suited for applications such as standby generator sets or other applications where vibration, dirt, moisture, and excessive cycling are not present.
Wiring Diagram Here
In the installation of “internally switched” dual coil solenoids, it is critical that the solenoid
plunger be allowed to travel to its fully engaged position to insure that the plunger will
automatically open the internal switch and disconnect the high current pull-in coil, eliminating
the chance of coil burnout. Improper linkage adjustment will cause coil burnout within 2 minutes. Please follow instructions carefully. Solenoids that burn out due to improper adjustment are not covered by warranty.