Can You drain coach batteries while driving?

Do you have an inverter?
If using it a lot while driving down the road. This Gould be a big draw that the engine altanator can not charge fast enough.
My wife used to use it a lot watching TV until the KD died.

Yes, it is possible. How likely depends on what your wife will be doing "Playing House". The reality of it is, in most RVs that I have had experience with, things like TV's, Microwaves, and standard plug-in appliances will not work off of 12 volt power, so she would have to consciously turn on either a generator or inverter to get the 120v system running. With you mentioning that your coach is a more modern one with LED lighting and such, it doesn't seem as likely that she is going to kill your batteries faster than they are charging.

Jim Shoe I'd check your wiring the alternator on the engine should also be charging the house batt. while driving.

LOL. After 39 years I know better than to TELL my wife anything, but bouncing her off the wall a couple of times might work.

In a "normal" setup, the engine charges the chassis battery first and then the house battery. Normally, this is enough to keep both charged up. If your alternator is defective or your electrical demand is extreme, than the battery may run down.

If the electrical demand is the problem, you could always use your generator intermittently. Keeping your better half happy is worth the price of a few hours use of the generator.

Coach and house battery same thing.
Chassis and engine battery same thing.

rvit wrote:
Ok, more specific then. It's a 2014 Pleasure way Pursuit with modern features like LED lighting. I would hope that it has good wiring(considering the astronomical price).

It is our first RV and my wife is going to sit in the back and play house while I drive. She doesn't have a "conservation" bone in her body so how much trouble am I in?

Tell her she has to sit and wear a seatbelt. After a couple of swerves and hitting some bumps, she won't be back their playing house much longer.

Short answer: YES:;; Read dozens of threads on using a RESIDENTIAL fridge instead of an absorption cooling unit in your RV..

My RV type (Absorption cooling unit) Draws 350 watts when run on A/C.. that is faster than the alternator can charge the batteries as it turns out. Many residential units draw power in that same range or more.

Also a failed isolator or bad connection or blown fuse.

Need to sort out between an rv being towed versus a motorhome. An rv being towed if running something as heavy as an inverter could run the battery down. A motorhome uses much heavier wire that can be used to "jump start" the engine battery by pushing a button. Once the vehicle is running,heavy current can easily flow and keep up with any loads. That said, it is always advisable to run the generator if the coach battery bank is low in order to reduce the load on the alternator which is not designed for charging large banks of batteries.

So, in your case it is highly unlikely you would run your coach battery down.

Yup, done that. Ran out of propane so turned the inverter on to run the fridge while we were going down the road. It got the battery bank down to minimum voltage required by the inverter & it shut off.