Hi, welcome. I checked and there is a member "BattChief" but he has not visited this website in over 5-years. Besides, if you follow it was RLS that mentioned creating a step by step and never did. However, he hasn't revisited here in over 6-years.
On the repair front, I suggest you start anew and ask for help from other 2002 Horizon owners - here or on www.irv2.com
. OH, I see you have another thread on this already on the forum. Best to use that one, rather than to confuse things with two threads on the same topic. I'll close this one.
You might hire an independent mobile rv tech to come and take a look at your situation, too.