I'm putting this here because it applies to either C10 or C14.
I'm building a mircroprocessor controlled relay, mainly for myself and friends but I may decide to produce it. The idea is that it will turn off accessories at low system voltage (idle) so you can power up stuff that only works at RPM's that will generate enough power. (Heated gear comes to mind)
It will also turn it off if there's ever a an over-voltage condition to protect it from damage. Imagine your I'phone and GPS runnign of this! There's a dash mounted indicator to act as a voltage monitor.
It has ground, battery, and ignition connections and a pair of relay connections for the device being powered. Here's how it works
Ignition off - the relay's off and the dash indicator blinks red once every few seconds to simulate an alarm (the please don't steal me mode used in various BMW cars for years)
Ignition on, battery voltage in normal range - Relay on, dash indicator solid on green.
Ignition on, battery voltage below normal but not critical - Relay on, dash indicator blinking green
Ignition on, battery voltage critical or below - Relay off, dash indicator blinking red
Ignition on, battery voltage dangerously high - Relay off, dash indicator alternating green/red.
So I've got a prototype built and software written and everything works. I need to settle on voltage points for Critical, Normal, and High. I'd make them adjustable but then it becomes difficult to make the unit completely waterproof. I've currently thinking
Critical - Below 11.5V
Warning - 11.5 to 12.5V
Normal - 12.5V to 16V
Overvoltage - above 16V
Any thoughts on the idea or the thresholds?
Thanks, Bill