The current trend or not...I rewired my prevost to 12 volt and I don't regret it one bit. I brought 2 trace inverters for the price of 1-24 v. Lights, relays, gauges are cheaper ...you can go to any auto parts store and get what you need (in stock) is stead of running around town looking for the same part in 24 v that probably has to be order. Bottom line....everything is easier to find and cheaper in 12 Volt.
Richard...I replaced the dash and all the old relays in the front connection box (under drivers side window) I took the electronic dash out of a 96 Navistar hiway truck with all the relays and fuse box ( as a side note I also took the electric wiper motor, dash defrost fan motor and tilt telescope steering /w integrel steering box). The front connection box is just that, a clean connection box with no 1940 relay and diode set up for the alarm system. I had to run about 6 new 10ga wires from the front connection box to the back connection box and that was it. I simpliflied all the wiring on the bus by rewiring the bus as per the Navistar electical schematics and removed all other circuits that were requ'd the the bus was a bus.I replace the motor out of another wreaked truck I bought...got rid of the 8v71 and put in a 8v92ta 475hp (I live in the mountian in BC. ...there's not a flat road out of this town). I had remove the OTR bus air so I didn't requ'd the big 24v alternator (and that to me looked like another big expence if it broke) The 8v92ta had 5000 miles on it when it crashed (DD relibuilt) and had all 105 amp 12v alt and starter on it. I added another 150 amp alt 12v for the house batteries.I wouldn't recommend this for everyone ...you have to be able to read and understand schematic and have a good understanding on DC circuits and power loss / lenght of run / loads, etc.