HR Navigator electrical gremlins

For sometime now, I've been experiencing what I think may be bad ground issues. My TriTek computer will at random start showing bogus readings in regards to fuel mileage and my tach needle will jump. On my trip home from Colorado, my smart wheel lights failed, AC blower motor failed, windshield wipers quit, cruise control light on dash glows constant very very dim, regardless of selection of cruise on or off, and now my engine break doesn't work. Can anyone shed any light on where I should begin searching? I'm unable to take coach to repair facility for sometime and need a resolution if possible.

Thanks
Corey Graham
2002 Holiday Rambler Navigator 45DCDS
90k miles