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Old 08-20-2018, 10:49 AM   #1
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Question about the main battery fuse

I just bought a new Hummingbird from our local dealer. When the guy was showing us everything in the walk through he left on the radio, the booster for the TV antenna, and probably the TV too. When I got home I just left it hooked up to my truck. The next day I went to unhook it, and after I unplugged it from my truck the power tongue jack would not work. Nothing 12 volts would work not even the battery gauge inside my camper. I could plug my truck in and all 12 volt stuff would work. I remembered that he may have left some stuff on, so I pulled the battery and hooked it up a float charger I have in the garage, and it was less than 25% charged. I left it hooked up until it had a full charge. That took over night. When I put the battery back on the trailer i still had nothing unless it was hooked up to the truck. Oh yeah i forgot to mention that the battery ring lugs were the worst thing i have ever seen. They had corrosion, and the wires were very loose. I thought that may be the problem, so I replaced them. Still no fix so i started looking at fuses. All fuses good that i could find. What they didn't show me during my walkthrough, but i finally found was the 30amp fuse at the back of the trailer tounge. It was blown, and of course I don't have a 30amp on me, but I will today. Anyway I put a 15amp fuse in it just to see if that was my problem, and I think it is. I was able to bump the tounge jack, all led lights work, and fans work. I didn't try the large items with the 15amp fuse.
Finally my questions. Why do you think the main fuse blew? Was it because of the terrible battery connections causing a bad ground, or bad positive? Was it because the battery was drained so low it was drawing a lots of amps trying to recharge through the camper system?
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Old 08-20-2018, 11:19 AM   #2
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It could be a combination of the things you mentioned. Another common reason for that fuse blowing is when the tongue jack is extended to far in either direction.
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Old 08-20-2018, 11:22 AM   #3
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The most common reason for blowing that fuse is running the tongue jack too far up or down. IMO, buy a few 30amp fuses and try the jack before perusing other reasons.
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Old 08-20-2018, 11:25 AM   #4
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X2. That also happened to us.
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Old 08-20-2018, 11:27 AM   #5
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This is the first electric tounge jack I have ever had, so that is good to know.
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Old 08-20-2018, 12:20 PM   #6
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I blew the 30 amp fuse on ours the first day we had it, raised the jack up too far. It doesn't take hardly anything to blow that goofy fuse, I now have a box of those silly green fuses in my tool box.....of course it hasn't happened again in 2 years because the jack operator is now properly trained
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Old 08-20-2018, 04:28 PM   #7
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I can attest to the Jack Fuse issue, although my after market Jack has a resettable breaker instead of fuse. Iíve had to reset it at least 4 times since I bought the camper in March 2018.
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Old 08-21-2018, 07:58 AM   #8
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Replaced fuse with circuit breaker. Note color of wires

After blowing this fuse 3 times I replaced it with a 30 amp breaker. I find it is much easier to reset, especially in the rain or at night.
Attached Thumbnails
30 Amp Breaker Resized.jpg  
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Old 08-21-2018, 08:11 AM   #9
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Quote:
Originally Posted by travelingjw View Post
After blowing this fuse 3 times I replaced it with a 30 amp breaker. I find it is much easier to reset, especially in the rain or at night.
Great idea.
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Old 08-21-2018, 08:14 AM   #10
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Quote:
Originally Posted by travelingjw View Post
After blowing this fuse 3 times I replaced it with a 30 amp breaker. I find it is much easier to reset, especially in the rain or at night.
Since you have that picture up there, what is the thing with the red rubber cover for? I assume it is some kind of thermal breaker. What is it for?
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