Batteries
Hello, 2004 Tiffin Phaeton, My dad has one of the his chassis batteries that he thinks might be week. Both were changed in 2013. My question is, can he run two batteries in parallel that have diffe...
Forum Discussion
Since you said that they are chassis batteries (SLI Starter Lights Ignition) it would depend on the specifications for that particular chassis, e.g. Freightliner, Spartan etc. Most chassis require a minimum CCA to be able to handle the engine pre-heat, glow plugs and other drains on the battery bank and still start the unit. In some cases they are wired in parallel so you still get 12VDC in other cases they are in series and you get 24VDC. If they are in series then you have more of a problem. You get the CCA of the weakest battery. I.e. you can add the voltage together but not the amps when you are running batteries in series. If the batteries are in parallel it and the lower of the two batteries is at or exceeds the minimum CCA for the coach then you will be fine. E.g. coach manufacturer requires 2 x 600 CCA batteries and you have one 600 CCA and one 700 CCA. That is no problem. If the coach manufacturer requires two 700 CCA batteries and you only have one, then you potentially have an issue.
