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08-20-2018, 09:49 AM
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#1
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Member
Join Date: Aug 2018
Location: Milton
Posts: 85
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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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08-20-2018, 10:19 AM
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#2
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Senior Member
Join Date: Jun 2016
Location: Newburgh
Posts: 6,307
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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.
__________________
2022 33RBTS
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Equalizer 4 Point WDH
2021 Ford F350 7.3
Air Lift Rear Bags w/ On Board Compressor (Pending)
2016 28BHBE - (Traded and Missed already)
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08-20-2018, 10:22 AM
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#3
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Senior Member
Join Date: Dec 2014
Location: FL
Posts: 11,281
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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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Sherm & Terry w/rescue Eydie (min Schnauzer) & Charley (std Poodle)
SOLD:2015 Jay Flight 27RLS, GY Endurance (E), Days: 102 '15, 90 '16, 80 '17, 161 '18, 365+ '20
SOLD: 2006 Ford F350 PSD, 4WD, CC, LB, SRW, Camper pkg., 375,000mi
Full timing: Some will think you're crazy, some will be envious, just enjoy the freedom!
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08-20-2018, 10:25 AM
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#4
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Member
Join Date: Jul 2018
Location: St. Charles
Posts: 75
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X2. That also happened to us.
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Ginny and Eric Malm
Daisy the Boston Terror and the late MacDuff
2018 Whitehawk 26 RK
Tow Vehicle 2013 Toyota Tundra 5.7 Limited
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08-20-2018, 10:27 AM
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#5
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Member
Join Date: Aug 2018
Location: Milton
Posts: 85
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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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08-20-2018, 11:20 AM
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#6
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Senior Member
Join Date: Aug 2016
Location: Middle, TN
Posts: 1,098
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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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08-20-2018, 03:28 PM
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#7
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Senior Member
Join Date: Mar 2018
Location: Albany
Posts: 116
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I can attest to the Jack Fuse issue, although my after market Jack has a resettable breaker instead of fuse. I’ve had to reset it at least 4 times since I bought the camper in March 2018.
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08-21-2018, 06:58 AM
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#8
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Senior Member
Join Date: May 2016
Location: Milpitas
Posts: 1,627
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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.
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2019 Chevy express 2500 Van Coversion. 2017 Jayco 23MRB: 26' total and Glacier Package. 2 Renogy solar panels. Married 49 years. Haley the mutt, 4 years old. "Excited to learn new things everyday and humbled by those who offer to help." And very grateful to our Moderators!
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08-21-2018, 07:11 AM
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#9
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Member
Join Date: Aug 2018
Location: Milton
Posts: 85
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Quote:
Originally Posted by travelingjw
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.
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Great idea.
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08-21-2018, 07:14 AM
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#10
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Member
Join Date: Aug 2018
Location: Milton
Posts: 85
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Quote:
Originally Posted by travelingjw
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.
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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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08-21-2018, 07:18 PM
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#11
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Member
Join Date: Aug 2018
Location: Milton
Posts: 85
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Anyone know what that thermal breaker behind the red rubber cover is for? Assuming that is what that is. I can't imagine it being for the same circuit as the one the 30amp fuse is on.
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08-21-2018, 09:29 PM
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#12
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Senior Member
Join Date: Apr 2016
Location: SW Washington
Posts: 1,024
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It's not a breaker. It is a 2-lug terminal. Underneath the red cover are two posts.
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2009 F350 CC LB 4WD
2017 Jayco 355MBQS
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08-22-2018, 12:20 AM
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#13
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Member
Join Date: Aug 2018
Location: Milton
Posts: 85
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Quote:
Originally Posted by Rustysocket
It's not a breaker. It is a 2-lug terminal. Underneath the red cover are two posts.
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Are you sure? What would be its purpose?
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08-22-2018, 09:20 AM
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#14
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Senior Member
Join Date: Jul 2011
Location: Long Island, NY
Posts: 1,402
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Quote:
Originally Posted by travelingjw
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.
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I just purchased one of these to use as my battery disconnect. It looks well built, is waterproof (used in marine applications) and Bussman has a good reputation for reliability. I'm going to do as you did, remove the 30 amp fuse and replace it with this circuit breaker.
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08-22-2018, 12:07 PM
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#15
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Senior Member
Join Date: Apr 2016
Location: SW Washington
Posts: 1,024
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Quote:
Originally Posted by mtbbrewer74
Are you sure? What would be its purpose?
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Im positive. I've had the cover off and looked at it.
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2009 F350 CC LB 4WD
2017 Jayco 355MBQS
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08-22-2018, 12:15 PM
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#16
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Member
Join Date: Aug 2018
Location: Milton
Posts: 85
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Quote:
Originally Posted by Rustysocket
Im positive. I've had the cover off and looked at it.
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Ok cool. Mine just looks thicker than nessacery to be a terminal. I still can't figure out why they would put a terminal there.
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08-22-2018, 07:59 PM
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#17
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Senior Member
Join Date: Mar 2018
Location: Albany
Posts: 116
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Quote:
Originally Posted by mtbbrewer74
Ok cool. Mine just looks thicker than nessacery to be a terminal. I still can't figure out why they would put a terminal there.
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Just my thought, but maybe for “adding accessories” ????
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09-05-2018, 04:55 PM
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#18
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Senior Member
Join Date: Oct 2017
Location: Portage
Posts: 115
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Blown 30 amp fuse
Quote:
Originally Posted by Marcm157
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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The tongue jack is the culprit. Same thing happened to me. I've purchased a few fuses and am mindful of not over extending the jack in either direction. Eight months later I haven't blown another fuse! Good luck!!
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09-05-2018, 05:23 PM
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#19
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Senior Member
Join Date: Sep 2010
Location: Fresno
Posts: 205
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Quote:
Originally Posted by mtbbrewer74
Anyone know what that thermal breaker behind the red rubber cover is for? Assuming that is what that is. I can't imagine it being for the same circuit as the one the 30amp fuse is on.
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It is a 50 amp auto reset circuit breaker to protect the 12v system from problems at the battery. Look up Bussmann CBC-50HB. The only reason I know this is I just put solar on my trailer and the electrical diagrams I requested from Jayco show it. I was wondering what it was also!
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Tom & Jill Williams
2015 Jayco Jay Flight 27RLS
2017 Ford F-250 4X4 Crew Cab 6.7L Diesel 3.55 E-Locker
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09-05-2018, 05:30 PM
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#20
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Member
Join Date: Aug 2018
Location: Milton
Posts: 85
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Quote:
Originally Posted by tbwill
It is a 50 amp auto reset circuit breaker to protect the 12v system from problems at the battery. Look up Bussmann CBC-50HB. The only reason I know this is I just put solar on my trailer and the electrical diagrams I requested from Jayco show it. I was wondering what it was also!
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It looked like an auto reset breaker.
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