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Old 07-20-2018, 07:15 PM   #1
Skoolie
 
Join Date: Mar 2018
Location: MO
Posts: 145
Year: 1978
Engine: Detroit 6-71
Crown bus main fuse need replacement

I need to get a spare fuse just in case this one craps out and I can't turn the bus on, this fuse when taken off doesn't allow any electrical to work on the bus, I am including a picture of it, any crown bus specialist I could use some help on the part number or like model (amps)

Would very much appreciate it guys.
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Rawlings is offline   Reply With Quote
Old 07-20-2018, 11:05 PM   #2
Bus Nut
 
Join Date: Jun 2016
Location: Orange County, CA
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Year: 1990
Coachwork: integral
Chassis: Crown Supercoach II (rear engine)
Engine: Detroit 6V92TAC, DDEC 2, Jake brake, Allison HT740
Rated Cap: 37,400 lbs GVWR
It's just a normal Class H fuse. Grainger or any decent industrial hardware store would have them. Mine are marked REN-100, and they have replaceable fusable elements inside them which are available in all ampacities, but you need a 100A fuse. (At least, mine is. You should check your bus's Parts Catalog or Service Manual for its exact rating in case it's different than mine.)

I had very bad corrosion where the feed from the start batteries' Cole-Hersee master switch enters the fuse holder, to the point that my engine cut out several times while driving. The DDEC computer was not getting enough voltage to work consistently because the corrosion was causing significant voltage loss under load. The original cable set screw was immovably corroded into its aluminum block, so I bought a similar-looking cable clamp from Home Despot (a Gardner Bender, I think, maybe?) and filed it to fit the fuse holder. Voila, no more voltage loss. You may want to check your fuse holder to see if it, or the cables in and out of it, are corroded - if they are, you'll have plenty of weird electrical gremlins happening, even with a MUI engine. You won't find Class H fuse holders exactly like our buses' any more, and the current ones are a different size and shape, so if yours is bad you'll need to fix it.

John
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Old 07-21-2018, 08:06 AM   #3
Bus Geek
 
Join Date: May 2009
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Chassis: International S3800
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Quote:
Originally Posted by Iceni John View Post
It's just a normal Class H fuse. Grainger or any decent industrial hardware store would have them. Mine are marked REN-100, and they have replaceable fusable elements inside them which are available in all ampacities, but you need a 100A fuse. (At least, mine is. You should check your bus's Parts Catalog or Service Manual for its exact rating in case it's different than mine.)

I had very bad corrosion where the feed from the start batteries' Cole-Hersee master switch enters the fuse holder, to the point that my engine cut out several times while driving. The DDEC computer was not getting enough voltage to work consistently because the corrosion was causing significant voltage loss under load. The original cable set screw was immovably corroded into its aluminum block, so I bought a similar-looking cable clamp from Home Despot (a Gardner Bender, I think, maybe?) and filed it to fit the fuse holder. Voila, no more voltage loss. You may want to check your fuse holder to see if it, or the cables in and out of it, are corroded - if they are, you'll have plenty of weird electrical gremlins happening, even with a MUI engine. You won't find Class H fuse holders exactly like our buses' any more, and the current ones are a different size and shape, so if yours is bad you'll need to fix it.

John

or install or a more modern 100 AMP fuse / circuit breaker.



I use these style for the Air-conditioners (road A/C) on my DEV bus..



https://www.amazon.com/dp/B001PYK5JQ...&pd_rd_w=qOyps
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Old 07-25-2018, 10:44 PM   #4
Skoolie
 
Join Date: Mar 2018
Location: MO
Posts: 145
Year: 1978
Engine: Detroit 6-71
Quote:
Originally Posted by Iceni John View Post
It's just a normal Class H fuse. Grainger or any decent industrial hardware store would have them. Mine are marked REN-100, and they have replaceable fusable elements inside them which are available in all ampacities, but you need a 100A fuse. (At least, mine is. You should check your bus's Parts Catalog or Service Manual for its exact rating in case it's different than mine.)

I had very bad corrosion where the feed from the start batteries' Cole-Hersee master switch enters the fuse holder, to the point that my engine cut out several times while driving. The DDEC computer was not getting enough voltage to work consistently because the corrosion was causing significant voltage loss under load. The original cable set screw was immovably corroded into its aluminum block, so I bought a similar-looking cable clamp from Home Despot (a Gardner Bender, I think, maybe?) and filed it to fit the fuse holder. Voila, no more voltage loss. You may want to check your fuse holder to see if it, or the cables in and out of it, are corroded - if they are, you'll have plenty of weird electrical gremlins happening, even with a MUI engine. You won't find Class H fuse holders exactly like our buses' any more, and the current ones are a different size and shape, so if yours is bad you'll need to fix it.

John
Would this be it? It says vac 250, should it not say vdc??

https://www.amazon.com/dp/B000BQL9NU..._XkuwBbCEDDFA4
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Old 07-25-2018, 10:45 PM   #5
Skoolie
 
Join Date: Mar 2018
Location: MO
Posts: 145
Year: 1978
Engine: Detroit 6-71
Quote:
Originally Posted by cadillackid View Post
or install or a more modern 100 AMP fuse / circuit breaker.



I use these style for the Air-conditioners (road A/C) on my DEV bus..



https://www.amazon.com/dp/B001PYK5JQ...&pd_rd_w=qOyps
How would I hook that up, my bus has a slot for the fuse in the picture?
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