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Old 07-01-2023, 03:24 PM   #1
New Member
 
Join Date: Jun 2023
Posts: 3
Electrical nightmare

Recently purchased this 2004 Thomas Built MVP.
The electrical box is a mess. I clipped a few zip ties
to comb through the wiring and even the schematic
I can't make heads or tails of it all. Two owners ago, they
striped a majority of the wiring out and piled it in a storage
tub. Headlights, brake & reverse lights and windshield wipers
work. Hazards only work on the right side and not turn signals
(I've already order a new turn signal switch for that)
Question is should I just leave what is there alone since it all works
and wire all my newer stuff (LED light bars, stereo, cameras, etc) to a new fuse
box?
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DAngle385 is offline   Reply With Quote
Old 07-01-2023, 04:21 PM   #2
Bus Nut
 
Join Date: Jul 2019
Location: Suburbs of Winterset, OH
Posts: 802
Year: 2005
Coachwork: Thomas
Chassis: FS65
Engine: Mercedes 6.4L
Rated Cap: just the 2 of us
well it seems that bus manufacturers have ongoing contest for making the biggest, most convoluted rats nest possible. Maybe your bus was a prize winner?? Who knows, but most buses are like that. It is very tempting to clean that up, but be cautious! There are dozens of post from frustrated skooliers who pulled out "unnecessary" wires then discover that the bus won't crank or cranks but won't run. So, if/as you pull wires, after each section is disconnected, you should start the engine before pulling the wire. (That way, if you get a no start, you can reconnect with minimal effort.
The problems come when you start messing with safety stuff such as emergency window and door alarms. Also the "no child left behind" system if present.
I pulled enough wires from my bus to wire my 12v stuff and I still have a milk crate full of left overs.
Good luck!
as far as a second fuse block, if you install a power converted, that will have 12v fuse block built into it. That's what you'll use for the "house" 12v stuff, lights, water pump and such.
BarnYardCamp is offline   Reply With Quote
Old 07-01-2023, 04:48 PM   #3
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Join Date: Jun 2023
Posts: 3
Duly noted. I haven't pulled any wires so I'll just bind everything back together and tuck it away as neatly as possible and get a 12v inverter as suggested.
Thanks.
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Old 07-01-2023, 04:59 PM   #4
Bus Nut
 
Join Date: Jul 2019
Location: Suburbs of Winterset, OH
Posts: 802
Year: 2005
Coachwork: Thomas
Chassis: FS65
Engine: Mercedes 6.4L
Rated Cap: just the 2 of us
Power converter; takes your 30amp ac "shore power" down to 12v DC and has AC breakers for things like your air conditioner, electrical outlets and such.
power inverter; bumps 12vDC up to 120v AC
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Old 07-01-2023, 11:31 PM   #5
Mini-Skoolie
 
Join Date: Oct 2022
Posts: 21
Make sure to check any wires that are loose for any chafing. I found a few spots on mine where it shouldn't of had a chance to!
Byrd Scheit is offline   Reply With Quote
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