Flashing LEDS I suspect is LOW VOLTAGE; have even had some flash/ strobe for home porch lights w/ motion detector, (and had to replace w/ Incandescent, DIMMABLE LED showed improvement?). In your case, I suspect coach battery is LOW/ dead, but voltage starts coming up w/ engine running, which also charges coach battery.
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(TerryH.) 2000-GS Conquest Limited 6266 Class-C 99-E450SD V10
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