When I start my coach after it's been sitting for several weeks, my alternator light does not go out, and my tachometer does not register. After driving it for 30-40 miles, the light starts to flicker, my tachometer starts registering, and the alt light goes out. Initially the coach is charging at under 10V but then slowly the voltage creeps up after 30-40 miles then the voltmeter will register a normal charge, the alt light goes out, and the tachometer starts working.
When I check the alternator, it's fine.
Could use some help.
Thanks
Jody