Sounds like you need to call J R back and do some troubleshooting with him. Jumping something is only good for a work around until you get where you’re going and can make proper repairs.
2019 Tiffin Phaeton 40IH
2005 Newmar Kountry Star Gas (Sold)
2017 Grand Cherokee or 2017 Harley Ultra in tow
JT, Em & the boys, Kong & Baxter (rescued grey tabbies)