The day we started a 12 day cruise
through the San Juan Islands
I noticed that my battery monitor
only showed our batteries at 12.4 with an amp drain still happening on the batteries even though the engine
was running. It ended up that the oil
pressure switch had failed and when that happened, it turned off the current
from the alternators to the batteries. If I installed a "jump" over the pressure switch, my pressure gauge came back up and my alternator
began to pump out the amps.
When I stopped the engine
, I had to remove the "jump" wire because it was draining over 3 amps from the batteries. With the wire removed, they stopped getting drained. I finally set up a toggle switch to turn it on(engine on) and off(engine off)as we moved through the islands
I've been told that it was set up that way to protect the electronics
on the boat in case the pressure failure resulted in a run away engine producing far more amps and power than my system could absorb. That surge could burn out equipment
Anyone ever hear of a system being set up this way? Sounds strange to me.