That still doesn't make any sense.
With engine off, and gen on, you get 13+V at the chassis (car) battery and only 11.8V at the house battery? Sounds to me you have chassis and house battery mixed up. Instead of measuring at the solenoid, measure directly at the chassis and house batteries.
Get solid measurements.
Is this how your solenoid looks?
If it is then you're in luck. Disconnect both chassis and house batteries ground and remove solenoid. Take a hacksaw and cut the aluminum cover just below the electrical connections all the way around. Don't cut deep, just the cover. Now you can see the contacts that need cleaning. Get some fine sand paper to remove the pitting. Duct tape the cover back on and install. I've done this, it works.
mdecorso wrote:
With generator on I am getting 13+ at the car battery, and then fluctuations of 11.82 to 12.04 at the house battery.
