How long until my batteries drain to much?

I can't tell you how long....however the truck will protect itself from the tv draining the batteries to the point of not starting. Low voltage disconnect or something like that. An alarm will probably go off.

 

You will (Or should) get an audible warning just prior to shutdown. How long that is depends on lots of things.

1. How long did you go (drive) prior to where you're at now
2. How long have you put a load on your batteries since you shut down
3. How many items, besides the TV are you running (Or have you run)
4. Have you idled at all since you shut down (And for how long)

Cascadias (At least mine) are equipped with a low voltage shutdown. Your's probably has the same. The shutdown protects your batteries from a low voltage condition that would make the truck unable to crank.

Fix? Idle the truck.

 

You gotta experiment with this...to many variables.

 

Check your gauge. The only way to allow the batteries to come up to full snuff is over a 6-9 hour period of time which usually occurs normally as you drive during the course of a day. Minor loads (Or drains) on the electrical system shouldn't drain the batteries too much.

Like I said, check your voltage gauge. What's it showing?

 

Who do you drive for? Might want to ask a driver from your company. All companies have different setups.

 

How many batteries do you have? 3 or 4? Also are you pulling a reefer?

I have the same TV and my batteries will last 4-5 hours before it starts running low. But if you have a reefer get a nice pair of jumping cables (not the cheap crap) and incase your batteries get low plug it to the reefer and run the reefer hard so it kicks out more energy. It should get you to start the truck up and let your alternator do its job. That's if you were to have your batteries drained by any chances.

 

You should still be good. However, just to be on the safe side, I wouldn't put anything else on the batteries and shut down down the TV.