Coach Battery
For some reason my coach battery will not charge when the engine is running. It used to. I have checked all of the fuses and all looks good. It will charge with the gen. or plugged into shore power. W...
Forum Discussion
I would replace your RV's battery charging solenoid with what ron.dittmer showed in his upper photo - but a much better version.
This approach will eliminate any voltage drop from "diode type" interconnect devices, such as is shown (I think) in ron.dittmer's lower photo. You always want the full alternator output voltage being applied to your battery terminals - not anything less. Here's a better version of the stock solenoid that comes in so many RVs. It even has a silver alloy contact option to stop corrosion of it's contacts ... and it's what I installed in our MH after the stock solenoid failed in a couple of years such that my coach batteries were not getting charged from the alternator:
http://shopping.murcal.com/Catalog/Bear-DC-Contactor-Family/114-1211-020;jsessionid=0a010c471f43e3c1a11ecc744d4b88c1f3921dcee21e.e3eSch4MaN4Re34Pa38Ta38Naxf0
This approach will eliminate any voltage drop from "diode type" interconnect devices, such as is shown (I think) in ron.dittmer's lower photo. You always want the full alternator output voltage being applied to your battery terminals - not anything less. Here's a better version of the stock solenoid that comes in so many RVs. It even has a silver alloy contact option to stop corrosion of it's contacts ... and it's what I installed in our MH after the stock solenoid failed in a couple of years such that my coach batteries were not getting charged from the alternator:
http://shopping.murcal.com/Catalog/Bear-DC-Contactor-Family/114-1211-020;jsessionid=0a010c471f43e3c1a11ecc744d4b88c1f3921dcee21e.e3eSch4MaN4Re34Pa38Ta38Naxf0
