As I stated in
this topic when I suggested that you start this one, your chassis batteries should be charging from your on-board charger, either a converter or Inverter/charger, as long as you are plugged into shore power.
The first thing you need to do is ensure that the battery disconnect switches by your entry door are turned ON. Your unit probably has an Inverter/charger rather than (or in addition to) a converter and
may not depend on these switches being ON, but it won't hurt to turn them ON, and leave them ON anyway. Most lower end coaches (those without Inverter/chargers) must have these switches ON.
Next thing you need to do is to determine if your charger is working. To do this, measure the voltage directly at the
house battery terminals. The voltage should be at least 13.2vdc. If the voltage is anything less than that, the charger is not working properly. You need to find the reason before proceeding further.
If the charger is working, proceed to the next step.
Secondly, you need to check the voltage on the
chassis battery. This voltage should be exactly equal to the voltage reading on the house batteries, because they should be connected together by the charging circuitry in the BCC (Battery Control Center) box.
If the voltage is lower than that measured at the house batteries, the relay (solenoid) used to make this connection is not activated. This can be caused by circuit failure in the BCC or a defective relay.
A quick test, at this point, would be to
PRESS and
HOLD the
AUX START switch, while trying your normal coach start procedure. If the Aux Start procedure works, (the engine cranks) the problem is in the BCC circuitry, If it does NOT, the problem may just be a defective relay.
The
same relay is used for both the charging and the aux start processes. It could well be the failing component. Good luck........