Battery light on dash on

tderonne wrote:

PaulJ2 wrote:
Battery light will come on also if the PCM thinks the voltage is too high.
Maybe with generator running while driving causing this.

FINALLY!

This is probably it. If the coach is set up to charge the chassis battery while parked, that same setup will try to charge the battery any time the generator is running. If the voltage it's applying is greater than the alternator voltage, you'll get a light on the dash.

BINGO, The dash light will show fail if the voltage is too LOW or too HIGH. With the Genset ON, the chassis system is reading the slightly higher Converter/Inverter-Charger bulk charge voltage which trips the chassis system to send a fault. A quick way to STOP the problem when the Genset is ON in transit.

1. Do NOTHING. In 30 minutes it will go off once the charge rate from the genset drops
2. Turn on your Headlights and Dash AC and that higher amp draw will drop the voltage to lower levels and turn the light OFF.

There is a FIX for this problem. You install a Bosch relay to disengage the dual charge (chassis/Coach) battery combine solenoid when the Genset is running. When the Genset is OFF the solenoid functions as designed. When you have the Genset ON in transit, you do NOT need the Chassis Alternator charging the coach batteries. The inverter/Charger(or converter) supplies the batteries with the recharge. Doug