AS most of you that know me, I am a "motor mouth". I have a tendancy to leave my race car with the fan and water pump running, and go off BSing. I then have a low or dead battery.
I Just installed a solid state time delay relay, for the fan and WP. Turn the switch on and the units run, turn the swith off, and they shut off. Turn the switch on and forget to turn it off, and they shut off automatikly after a delay of (setable) 10 sec to 15 minutes.
http://www.airotronics.com/site/product-intervalon_TBL.php
These were a special order configuration, and took about 6 weeks to get.
If there is enough interest, I could see about a "group buy". I bought four of them at $45 each tax and shipping included. Depending on order size, I might be able get a better price.