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Old 09-25-2008, 08:01 PM   #1
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Univolt Help

1972 on shore power, no battery, nothing 12v works. I have 120 to the univolt, no blown fuses, but no volts across any of the fuses (could have tested it wrong). It is humming, and a little warm so it is doing something. Am I testing something wrong? Is it dead? Aslo how do you get it off the floor. I went after the nuts but they seem to just spin the bolt in the floor? Thanks for the help.
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Old 09-25-2008, 08:15 PM   #2
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Fairleigh,
Is there a 12V master disconnect switch that migt be in the "off" position??? Start testing at the terminals at the univolt. you should have at least 12V there and then work your way "away" from the univolt to see where you lose 12V. Do you have a multimeter to test with???
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Old 09-25-2008, 08:38 PM   #3
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I have a good multimeter, maybe just a bad operator (me). Where are the univolt terminals? Is there a diagram somewhere? I searched but no luck.
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Old 09-25-2008, 08:41 PM   #4
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Here I found this picture:
http://www.airforums.com/forums/atta...2&d=1210452261

This is what mine looks like. Can anyone lable the differnt terminals for me?
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Old 09-25-2008, 08:55 PM   #5
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Fairleigh,
I think the main power leads in the picture in the link you posted are the heavy gauge red and black wires to the left. There should be positive and negative wires / terminals / posts on the univolt somewhere. Can you take a picture of yours and post it here???
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Old 09-25-2008, 09:35 PM   #6
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Looking at the picture, the univolt outputs are the red and black wires. They attach to the back of the 12 volt distribution panel. I also see that the +12 volt line from the trailer battery is missing. It should be attached to the board on the left side, 2nd spot down. The wire above it comes from your TV by way a few items along the way.
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Old 09-25-2008, 10:39 PM   #7
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So it sounds like I will need to take the unit apart so I can test the 12v input at the back of the panel? If there is nothing there, but 120v going in, is it dead?
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Old 09-26-2008, 05:35 AM   #8
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Quote:
Originally Posted by Fairleigh View Post
So it sounds like I will need to take the unit apart so I can test the 12v input at the back of the panel? If there is nothing there, but 120v going in, is it dead?
Fairleigh,
That is correct. If you have 110 in and no 12V ourput then the univolt is kaput. Some folks in here know how to repair them. I on the other hand do not. I replaced the converter in my '87 with a Progressive Dynamics Inteli-Power converter model PD9260C from Randy at Best Converter. The old converter was working fine, but had a loud humm that was driving me nuts.
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Old 09-26-2008, 06:54 AM   #9
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Farleigh,

If you want to keep the rig looking original, this company will rebuild your Univolt to brand new condition. They rebuilt the ampmeter in the control panel for me last year. Here is the link:

Industrial Electronics Services - Repair, Engineering, Testing | NyCo-Systems

Good luck.
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Old 09-26-2008, 07:54 AM   #10
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do not dismiss your univolt just yet.

carefully check each side of the glass fuses for voltage.

1 fuses that look good can be bad

2 the fuse holders have rivits on the back of the panel that can loosen and cause intermittant operation.

3 the spring action of the fuse holders can leesen with time and look perfectly good but not pass current.

4 remember the negative cable is fused and could be open as well!

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Old 09-26-2008, 08:30 AM   #11
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Most electrical problems are stupid little things like loose wires. The hard part is finding them. The first think I would check is if your Univolt has a good ground connection. How did you test the fuses? If you tested from a ground in the Univolt and it was not really grounded you would get nothing. Use a ground like the skin or frame. If now your fuses are juiced, you have a bad ground somewhere. My first suspect would be the battery main ground wire
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Old 09-26-2008, 11:55 AM   #12
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Maybe this will help...
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Old 09-26-2008, 12:37 PM   #13
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Ok, all this information looks good, and I got the wiring diagram I have been looking for. I will poke around some more with the voltmeter and see what I find. Thanks!
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Old 09-26-2008, 06:25 PM   #14
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Is it dead?

Well, allright I give. The univolt is still humming away, and has 120 going in. Using the diagram for reference I used my volt meter to touch 1 to 3, 2 to 3, 2 to various possible ground points outside the univolt, and I even went to the battery cables outside all with absolute zero volts. Any more suggestions, or is it broken?
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