Originally Posted by Wotname
???? can you explain this in more detail ????
Sure. How a regulator works (simple version with no electrickery involved) is that it checks the voltage at the alternator output (internal regulator) or the house bank (external regulator). If the voltage being checked equals or exceeds the setpoint (usually around 14.2 +/- V) then the regulator says "I'm happy, no need to start charging
It's pretty much that simple.
You can do a simple test. Completely charge your house bank at least overnight and make sure it's full.
With shorepower still plugged in, and charger
on, and NO DC loads on, start your engine. The tach "most likely" but not always will do nothing.
Stop the engine, unplug shorepower (or turn your charger
off) and run some loads up to 5 or 10A, like the fridge, lights, etc. for 20 minutes or so.
Then restart the engine. The tach should be working.
The way this question usually comes up is this: "I just started my engine and the tach isn't working. What's wrong?!?" The answer usually is: "Are you still connected to shorepower with your charger on and/or are your batteries full?"
Many people will be aghast that I'm suggesting starting your engine with your charger still on. Nonsense. Many folks have more than one means of charging
, like solar, wind
, alternator and shorepower. I've never heard of anyone disconnecting their solar panels
Does that answer it for you?