I’m just finishing up my second custom inverter install for a client, and for this coach we had room for 9 group 29 batteries (yowza!).
The area we had to install them was previously occupied by the frame mount LP tank, so the height was somewhat limited (no room for 6 volt GC batteries), but the group 29s fit quite well.
I recently had a furnace come in- complaint was that nothing happened- no fan, no heat.. nothing.
Whenever I have a furnace problem, the first step I take is to go to the thermostat. This one had a simple heat only, mechanical thermostat. I pull the cover off, switch my multimeter leads to read amperage and hook up the leads across the thermostat terminals.