Chassis batteries needed charging.

draboo wrote:
I noticed that the chassis batteries were down to around 12.0 volts. The coach batteries are maintained well thanks to the inverter/charger system. I connected the chassis and coach batteries with a jumper to charge the chassis batteries for two days. I took off the jumper and the chassis batteries were at 13 volts. Now, a day later, they are down to 12.5 V.

Is this a normal voltage drop? Might they need replacing? I thought the inverter charged all the batteries, not just the coach.

Thanks for any info.

Brad
02 Holiday Rambler Neptune 34ft DP

I have a maintenance free chassis battery also from Walmart. I put a battery disconnect on it and it dropped from 12.6v on Nov 4th to 12.5 v on Dec 31st. House batteries were 12.6 to 12.4v for the same time frame. So no that is not a normal voltage drop for one day. All the batteries are 8 years old. The easiest way to tell if your chassis battery is being charged along with your house batteries when you are plugged in is to check the voltage at the pos and neg terminals and if you see around 14 v it is charging.