Coach battery not charging

Order a Cole Hersee 24213 relay from Amazon and install it in place of the existing relay. It will last the lifetime of the RV. The old one (on Winnebagos at least) looks identical but is 80 amp rated and has plain copper contacts. They burn up rather quickly, as they operate every time the engine is started. The CH 24213 has silver tungsten plated contacts and is rated at 200 amps and will probably never burn up. The old relay will have only one small terminal for the wire that operates the coil, the new one has two, you need to fabricate a short jumper to connect one of these two small terminals (either one, you pick) and connect it to one of the mounting bolts to complete the ground circuit for the coil. Very common problem.

https://www.amazon.com/Cole-Hersee-24213-Continuous-Solenoid/dp/B005K2429I/ref=sr_1_2?ie=UTF8&qid=1522722190&sr=8-2&keywords=cole+hersee+24213

Charles