[Chuck v]

There are three banks of batteries on a Tour Master: The 2 paralleled diesel cranking batteries, the two parallel house batteries (both pairs behind a basement door near the curb side rear wheels...) and the 4 each 6 volt batteries wired series/parallel that are behind the door under the windscreen-- these start the generator and provide power for the inverter.

In the stairwell there are two large rocker switches that disconnect the house and engine batteries when the coach is not in use -- these are lighted and you must have the right most one (marked 'chassis') turned up to crank the engine. If the engine cranking battery is too weak to start the motor, you can use the "aux start" switch on the dash (top row of rocker switches at the left most position) to TEMPORARILY connect the house batteries to the engine batteries to start the motor.

Have you had the coach stored or are you occupying it? Is it connected to shore power to keep the house batteries charged? The Tour Master coach does not have a shore power provision to charge or maintain the chassis/engine batteries so I have added a Battery Tender-type charger to mine to ensure that the coach batteries are fully charged when I need to start my engine.

Be sure to check the electrolyte level in all the batteries on a regular basis and keep them topped up -- when on shore power the inverter has a charger function that keeps the 6 volt batteries constantly charged and can cause quite a bit of electrolyte to be lost. Always use distilled water to add to a battery of this type. I replaced my original inverter with a pure sine wave type and that seems to have a more sophisticated charging system, but I still watch the levels. Since it is a bit difficult to see down into the cells where these 6 volt batteries mount, I have also added a watering system with hand pump -- makes topping off all 12 cells quite simple.

Good luck and let us know what you find is the root cause of your 'no-start' issue...

Chuck