| Big 12v Fuse in 78 Royale House fuse panel [message #337534] |
Tue, 02 October 2018 09:04  |
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thesmith
Messages: 589
Registered: February 2015
Location: Cary, NC
Karma: 6
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We were camping last weekend and all of a sudden there was a pop, all 12v (other than the fridge) went out and there was a smell of burning.
on investigation the buzz box was very hot and the big fuse in the 12v panel had blown.
I've ordered a new PD 9245C (iirc) power convertor which should arrive tomorrow.
however I forgot to pull the blown fuse so I could get replacement...and coach is not very close by...so question is what is the correct type and rating for this fuse?
hopefully the buzz box didnt toast my house batteries, fingers crossed.
thanks in advance
Pete
Cary, NC
1978 Center Kitchen Royale.
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| Re: [GMCnet] Big 12v Fuse in 78 Royale House fuse panel [message #337542 is a reply to message #337534] |
Tue, 02 October 2018 09:59  |
richshoop
Messages: 190
Registered: April 2017
Karma: 0
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First of all. Keep all the pieces before they go to the dumpster. Just replacing one piece in a system of pieces without doing the troubleshooting is just throwing money away.
I would suggest that replacing the original buzzbox with newer technology is a good insurance policy to extend the life of the coach batteries. So do that anyway.
Fuses are sized to protect the wire from melting.
You need to spend a little bit of time to determine what was happening at the time the fuse blew.
Sit down somewhere very quiet, nice fresh cup of coffee, pencil, and a nice clean sheet of quad paper.
Write down as much information that you can recall as to what was running just before the failure. Ask others as well. The less technical the person, the more likely they will have the 'critical' question.
Make a list of what the fuse protected. Then go digging into circuit, and keep digging until you find something that could cause the failure. If you don't find it the first time, you will have the same event again.
A common 'fix' is to substitute a larger fuse. Don't do it! If you do, the wire is no longer protected and it is possible the wire can heat up, melting insulation and worse.
> On October 2, 2018 at 7:04 AM Pete Smith wrote:
>
>
> We were camping last weekend and all of a sudden there was a pop, all 12v (other than the fridge) went out and there was a smell of burning.
> on investigation the buzz box was very hot and the big fuse in the 12v panel had blown.
>
> I've ordered a new PD 9245C (iirc) power convertor which should arrive tomorrow.
>
> however I forgot to pull the blown fuse so I could get replacement...and coach is not very close by...so question is what is the correct type and
> rating for this fuse?
>
> hopefully the buzz box didnt toast my house batteries, fingers crossed.
>
>
> thanks in advance
>
>
> Pete
> --
> Cary, NC
>
> 1978 Center Kitchen Royale.
>
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| Re: Big 12v Fuse in 78 Royale House fuse panel [message #337553 is a reply to message #337534] |
Tue, 02 October 2018 14:10 |
Scott Nutter
Messages: 782
Registered: January 2015
Location: Houston/San Diego
Karma: 4
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Senior Member |
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Pete
We're out camping now. If you need, I can take a couple of pictures of my breaker panel and send them to you if that helps. Only problem would be pulling out the supplies to get to the panel(our rear lounge was converted to a permanent bed, so it's all storage under the bed).
Call me if I can help
Scott 858-212-8760
Scott Nutter
1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, Dave Lenzi super duty mid axle disc brakes, tankless water heater, everything Lenzi. Alex Ferrera installed MSD Atomic EFI
Houston, Texas
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| Re: Big 12v Fuse in 78 Royale House fuse panel [message #337579 is a reply to message #337558] |
Wed, 03 October 2018 08:30 |
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thesmith
Messages: 589
Registered: February 2015
Location: Cary, NC
Karma: 6
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Senior Member |
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Matt, thanks for the comments.
The buzz box was HOT, as in too hot to touch, way beyond whats good for electronics (or being in a tinderbox RV)....even 70s electronics. yes it might still work and may not have directly been the cause..... but its coming out anyway and getting replaced with smarter modern one.
And I'm going to go down to a single 12v House battery for now. We don't really boon dock, and have good Onan genny in any case.
when I retire in a couple more years and start touring seriously, I'll get the two 6v batteries (in series) recommended, but for now, one 12v will be fine.
Pete
Matt Colie wrote on Tue, 02 October 2018 18:25Hey guys,
I have two things to add here and either may be significant.
First:
The buzzboxes that I still use as DC bench supplies both run kind of warm even when unloaded.
So don't use box temperature as a diagnostic there.
Second:
If you have two 12 jars in parallel, Watch Out!!
When I still did a lot of boat work, I used to like paralleled 12V banks as they provided a regular income. When one jar stumbles, the other can provide the needed power to make it explode. I still have the canned letter to insurance companies about how it was not as bad as expected, we saved the boat.....
The typical bill for the cleanup was three hours. That does not include repairs and new jars.
I also still have the baking soda shaker in the coach that says,
For Acid Spills and Emergency Baking."
Mary doesn't see the humor....
Matt - on the way to Erie PA for the night and Rochester NY tomorrow (no Walmart ONP there)
Cary, NC
1978 Center Kitchen Royale.
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| Re: Big 12v Fuse in 78 Royale House fuse panel [message #337605 is a reply to message #337534] |
Thu, 04 October 2018 09:54 |
Scott Nutter
Messages: 782
Registered: January 2015
Location: Houston/San Diego
Karma: 4
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Senior Member |
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Pete,
I'm my 78 center kitchen I don't have any 50 amp glass fuses by the breaker box. Is yours in the aft area of your coach? All I can see is a breaker box on mine. It all appears to be original. I don't think the previous owners changed out anything original. Being that the Royals were upfitted by coachman they are not all the same?
Scott.
Scott Nutter
1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, Dave Lenzi super duty mid axle disc brakes, tankless water heater, everything Lenzi. Alex Ferrera installed MSD Atomic EFI
Houston, Texas
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