Originally Posted by davegerr
The batteries in the house part of the motor home will not charge when driving but will charge when plugged in 2000 Adventure
The first thing you need to do is, find out what kind of charging system you have, for both systems, while the engine is running. You see, there are a few different models and types out there. Take mine for instance. The coach is an '04 Itasca Horizon, 36GD with the C-7 330HP CAT. On the dash is a switch called the "Auxiliary Start or, Battery Boost" (I can't remember whish it's called".
But, that switch, leads to a solenoid located in the left rear of the coach, in the shore power compartment. When you push on that momentary switch, it engages a very large solenoid that, links both sets of batteries, house and chassis, together, to start the engine, should the chassis batteries be too low in voltage to start that CAT.
But, that solenoid, has dual duty in this coach. You see, when the engine is started and, running, there is an alternate wire attached to that solenoid that engages it. When that happens, the charging from the alternator is directed at not only the chassis batteries but, also the house batteries.
So, that's how my system works. So, like stated, you just need to find out if your house and chassis battery charging system FROM THE ENGINE, not shore power, is similar to mine. This way you'll know how it's SUPPOSED TO WORK. Then, if you find out it's the same, this will allow you to analyze what section of the system is broke down and, why you're not getting a charge to the house batteries
Contrary to popular belief by some, about 99.999999999999% of the coaches made, gas or diesel, A or C or? in the last few decades, charge both sets of batteries while motoring down the road. There are a few different link-up methods for linking both sets together but, in the end, both sets get charged while driving.