If you find the lamps in your lighted rocker switches used to activate the relay don't last one or two deactivations, this explains why, and how to remedy. It works quite well, and can protect your other electronics from the spike.
We used the 50 cont duty solenoid in a rescue truck to power the accessory buss, the master lighted switch kept failing, first the light, then the contacts. A surge suppression diode was required.
http://www.suregripcontrols.com/install_suppress.htm
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