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Old 06-02-2011, 11:20 PM   #1
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Melted fuse holder.

I need some help with my 77 Soverign fuse panel.I've been removing the 2 50 amp fuses after both my new batteries were drained.When I purchased the trailer I couldn't get any electricity to the trailer and tracked the problem down to the old 50amp fuses.They looked fine but upon further inspection appeared to have gotten hot and were bad.I replaced them and problem fixed so I thought.Upon leaving the trailer for the night I went to remove the fuses and burned the crap out of myself.The fuse holder actually melted and the wire that runs between the 2 50 amp fuses is melted I'm sure due to the high heat.I know I could've just unplugged the batteries but oh well.
Anybody have any idea what's up with my trailer?Is the univolt to blame?I've looked all over that thing and can't find it.Could it be in the front of the trailer under the goucho?
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Old 06-02-2011, 11:31 PM   #2
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Hi, I know someone will dispute this, but the only thing that will cause a fuse or fuse holder to melt is a bad/loose/dirty/rusty connection. I have been repairing things like this since 1968 in cars and trucks.
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Old 06-02-2011, 11:32 PM   #3
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I blame everything on the old univolt...but really, I don't think it was to blame for fuse melted.
Something pulled a bunch of amps to blow a 50.
What did this supply power to?
If not blown, and just melted, a corroded<sp connector can do that.
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Old 06-03-2011, 12:04 AM   #4
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Thanks ROBERTSUNRUS and klattu for your quick replies.
The fuse holders were corroded when I got the rv home.I did clean them up.
This is the main 10 gauge wire (I think it's 10 gauge) from the battery or univolt.I think it supplies power to the fuse panel.
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Old 06-03-2011, 12:43 AM   #5
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Corroded connections cause this....

Power dissipated in a resistor is given by I**2 * R, or current squared times resistance.

A tiny resistance of .01 ohms will dissipate 50*50*.01 = 25 watts of heat at 50 amps of current with a small 1/2 volt drop across the connection.

This is why higher current connections, fuses, etc. are all bolted securely. Note that spring type fuse holders will also lose their spring as they heat, further increasing resistance.

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Old 06-03-2011, 07:47 AM   #6
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fuse panel

Quote:
Originally Posted by barts View Post
Corroded connections cause this....

Power dissipated in a resistor is given by I**2 * R, or current squared times resistance.

A tiny resistance of .01 ohms will dissipate 50*50*.01 = 25 watts of heat at 50 amps of current with a small 1/2 volt drop across the connection.

This is why higher current connections, fuses, etc. are all bolted securely. Note that spring type fuse holders will also lose their spring as they heat, further increasing resistance.

- Bart
Thanks Barts
Whats the best thing to do? Should I replace the whole fuse panel?Any idea where the univolt is located?
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Old 06-03-2011, 08:51 AM   #7
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ALL connections in any electrical circuit should be clean and tight. Otherwise, heat builds up and fires occur. Replace whatever you have to. Get everything free of corrosion and tightly connected. Also make sure nothing can rub and short out from vibration while traveling.

The old Univolts hum. Listen for it (or if you're like me, get someone with younger ears to do so), and it will reveal itself.
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Old 06-03-2011, 09:06 AM   #8
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Many of the high amp clip in fuse holders are riveted between the clips and the connection point. They loosen with age and then start overheating. It is a common problem and is not usually an indication of any problems beyond the fuse holder itself
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Old 06-03-2011, 09:19 AM   #9
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the converter might be located behind the gaucho under the shelf. if the shelf feels warm you're getting close, lol.

try peeking behind the gaucho drawer.
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Old 06-05-2011, 09:21 PM   #10
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Thanks everyone for the help!I found the Univolt and it was right where everyone suggested under the gaucho.Now I know what the hum is that everyone talks about.Well I guess the best thing to do is replace the fuse panel.That doesn't look like fun at all.Any source's for the fuse panel or upgrades that can be recommended?
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Old 06-05-2011, 10:45 PM   #11
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I would contact Randy at BestConverter - Converters, Inverters, Electrical Supplies, Electronics . He has been helping forums members for several years.
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Old 07-18-2011, 09:15 PM   #12
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Quote:
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I would contact Randy at BestConverter - Converters, Inverters, Electrical Supplies, Electronics . He has been helping forums members for several years.
Thanks for the advice.
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Old 07-18-2011, 09:32 PM   #13
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I am pleased with this one from Out-Of-Doors Mart. Easy to install, looks pretty rugged, and I like the metal lid;
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Old 07-18-2011, 10:40 PM   #14
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I am pleased with this one from Out-Of-Doors Mart. Easy to install, looks pretty rugged, and I like the metal lid;
Very nice, thanks for the info.
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