Have you checked that the chassis battery is indeed still good? Either via a load test or with a hydrometer. If you have the OEM battery in a 2018 coach it may be done in. My 2018 ACE the battery had a bad cell after two years of service. Remember your 2108 is built on a 2017 chassis and the battery is at least 4 years old at this point.
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2018 ACE 27.2
Toad 2019 Jeep Cherokee Trailhawk
Roadmaster Falcon All Terrain Towbar
Roadmaster Invisibrake
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