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Old 07-11-2017, 11:28 AM   #1
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1966 26' Overlander
Woodstock , Georgia
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No interior lighting

My wife tried to turn on one of the ceiling lights. She turned the switch the wrong way and all the lights went out.
The wall sockets still work and the exterior light being 12v still does as well.

I saw one AGS40 Fuse in the outside back access panel that is cloudy but not sure its blown.
I tripped and reset the two breakers in the bathroom, and no change.

I will have to seek out the glass fuse as although I have many extras, there is none like the one that I took out. All are smaller.
Though I do have a box of very heavy duty 50amp fuses, not sure why.

The filament in the fuse looks ok, but again the fuse was cloudy..any ideas?

Any other spots to check for fuses? I know of none.

Frye's electronics locally carries a lot of fuses, hopefully they will have these.

Just was there buying some for my old Fender amp...
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Old 08-12-2017, 11:53 AM   #2
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I replaced the fuse I though might be bad. No change. The Univolt is humming so I know it is on, but there is no 12v power. I traced the white wire that comes off it, I don't see any fuses in addition to the main fuse box in the access panel at rear end.
My manual says there is a 40 amp fuse somewhere...Anyone know where?

I have a bunch of large fuses that came with the trailer, no idea where they go yet.
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Old 08-12-2017, 12:15 PM   #3
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Quote:
Originally Posted by ALANSD View Post
I replaced the fuse I though might be bad. No change. The Univolt is humming so I know it is on, but there is no 12v power. I traced the white wire that comes off it, I don't see any fuses in addition to the main fuse box in the access panel at rear end.
My manual says there is a 40 amp fuse somewhere...Anyone know where?

I have a bunch of large fuses that came with the trailer, no idea where they go yet.
This happened to me last time out. I thought it was the switch, so I pulled the switch to test it. What I found was an inline automotive large size 10A fuse in a rubber protector on the line within a few inches of the switch. The closest replacement I had was a spare 7.5A mini-fuse. I plugged in the smaller fuse and the lights work again.

I need to get some spare large 10A flat automotive fuses for the next time this happens.

Hope this helps.
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Old 08-12-2017, 12:38 PM   #4
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good tip, I will pull the switch and the light it is on.
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Old 08-14-2017, 06:24 AM   #5
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Pulled two of the ceiling lights, did not find a fuse inline. I found only a red capped connector.
I cleaned all the fuse box parts and replaced all the fuses with new ones. Luckily I have a large box of spares.
I am sure not that it is the Univolt fuses that are suspect. It is going to be pita to acces these as the unit is under the bathroom closet and likely too far to reach from the access panel at rear. Some contortion may be necessary to unscrew the cover.
Found a good photo that will help.
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Old 08-14-2017, 07:14 AM   #6
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Do you have 12+ volts at the fuse panel in the UNIVOLT?
Just because it is humming doesn't mean it is working.
The 40 amp fuse is usually wired into the negative side and mounted on the skin. If there is one.
Have you tried connecting a battery charger in parallel to the Univolt just to see if things work?
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Old 08-14-2017, 07:17 AM   #7
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It looks like the wire at the left end of the shunt has come loose.
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Old 08-14-2017, 07:23 AM   #8
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Also noticed what looks like a fuse holder on the floor left of the Univolt
It is in the black lead which is the negative side of the 12 volt system.
The missing fuse at the top right in the Fuse panel and the addition of a circuit breaker on top of the Univolt tells me someone has made changes.
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Old 08-14-2017, 07:49 AM   #9
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sorry- that univolt is not mine. Old Forums photo. I have two circuits with 40 amp fuses one has been pulled for some time, it is for a second battery under the bed. The other fuse is fresh.
I was able to open up the side panel on the Univolt, it has the wires going in and out, looks original. No fuses visible. I also don't see any other panels to open on the unit. Shined a light in and around and could not see fuses. WTF?

I have not put a battery charger on anywhere. Don't have a battery in the trailer right now..
I have a box of 50 amp large glass tube BUSS fuses. Where the heck do they go? Came with the drawer full of parts.

Also there are brown square connectors at the bottom of the panel fuse box. Not sure what these are..
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Old 08-14-2017, 08:18 AM   #10
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You don't need a battery to use the charger.
Simply connect the charger to the + and - buss in the Univolt.
Pics would be nice. The Brown items may be circuit breakers, the 12 volt style.
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Old 08-14-2017, 09:22 AM   #11
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if these brown boxes are circuit breakers are they still available?
The missing 40 amp Buss type has been out for years. Its for the extra battery.

The Univolt is shown open ...for what its worth
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Old 08-14-2017, 09:26 AM   #12
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Hi

Head over to Home Depot and spend $20 on a multimeter. Run through the system tracking the 12V. It's *way* easier than guessing about this or that ....

Bob
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Old 08-14-2017, 09:44 AM   #13
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I ve got one already, I have a few cars I work on around here... Will try it and see where the power stops.

Hey by the way I love Carlisle. Been to the import show there a few times. My brother lives in Lancaster.
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Old 08-14-2017, 10:39 AM   #14
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Those are circuit breakers.
Have you lost all 12 volt DC?
No water pump power, fan power etc. Or is it just the lights?
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Old 08-14-2017, 04:32 PM   #15
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yes nothing works. Only the AC circuit is on.
I will use the multi meter tomorrow. Thought this had to be a fuse the way it happened.
Could be a dead Univolt? That would make 3 Airstreams in a row I have had that needed the converter replaced.
Not getting too far ahead, but would the old fuse panel in there work with a new converter?
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Old 08-14-2017, 04:45 PM   #16
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The old fuse panel will work. But for very little money you could upgrade to a blade fuse type panel.
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Old 08-14-2017, 04:51 PM   #17
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I will sing a song in remembrance of the old UNIVOLT if it is truly dead. It served me well for 6 years and someone prior to me for 43...
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Old 08-15-2017, 09:24 AM   #18
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Hi

Univolts were pretty darn rugged designs. Nothing lasts forever .....

Bob
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Old 08-15-2017, 10:50 AM   #19
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haven't gotten to it yet, but if its dead. ...I think I will keep the box as a shrine to things that last.
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Old 08-15-2017, 12:11 PM   #20
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haven't gotten to it yet, but if its dead. ...I think I will keep the box as a shrine to things that last.
Hi

Most likely it has a resonator capacitor on it with PCB's in it. Be sure to put the proper HAZMAT labels on the box

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