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Old 06-27-2009, 07:42 AM   #1
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Univolt and Fuse Panel - Can Somebody take a Pic?

Can somebody please take a picture of their fuse panel, univolt system in a 1972 model. My Sovereign 12v system has been altered quite a bit by the POs.

I'm also curious what circuit/fuse the exterior lights are on? Are they all on one circuit?
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Old 06-29-2009, 06:55 AM   #2
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Hope This Helps...

Mike,

Here are some pictures from our 76 center bath. Let me know if you need something more specific.

Regards,

Kevin
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Old 06-29-2009, 07:54 AM   #3
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Excellent! Thanks Kevin. Do you happen to know what circuit your running lights and tails lights are on? What is attached to those in-line fuses? I have those but they aren't connected to anything anymore.
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Old 06-29-2009, 05:43 PM   #4
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Don't know....

I can check in the morning when I get to the office.
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Old 06-29-2009, 11:10 PM   #5
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Do the running lights and tailights go through the fusebox? They are only connected to the umbilical to the TV, I thought.

Looking at the '74 Service manual, it shows that near the TV connector (very front of the coach, centre) there is a 12 volt 25 amp circuit breaker. That becomes the blue wire, which goes to circuit #5 on the Univoilt: "charge". In other words, that completes the circuit to charge the battery from the TV.

OK, found it: on page 209, it shows what I said above: the only connection that the tail lamps, turn signals, backup lights and running lights have comes from the 7-pin connector that plugs into the TV. They DO NO go through the fuse panel of the trailer.

And the 25 amp breaker up front is only to protect the charging circuit.

So if you are having problems with running lights, etc, look to the TV connector, or the sockets and/or wiring for the running/turn/backup etc lights.
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Old 06-29-2009, 11:30 PM   #6
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Quote:
Originally Posted by mello mike View Post
I'm also curious what circuit/fuse the exterior lights are on? Are they all on one circuit?
Now here, if you are talking about the round outdoor floodlight, that one is on the brown wire, circuit #4 in the Univolt.

The "steplight", which I believe is the one outside, over the door, is also connected to the brown wire, after it passes throught its switch via a brown/yellow wire, so see above.

Hope this helps.
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Old 06-30-2009, 07:05 AM   #7
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Some Answers...

Quote:
Originally Posted by mello mike View Post
Excellent! Thanks Kevin. Do you happen to know what circuit your running lights and tails lights are on? What is attached to those in-line fuses? I have those but they aren't connected to anything anymore.

Mike,

The small diameter lines with the in-line fuses (shown with the yellow arrows) go to the ammeter. Mine feed into the wall with the cord bundle.

The running lights are not on this circuit.

Here are some scans from my OM.

Thanks,

Kevin
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Old 06-30-2009, 07:13 AM   #8
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Running Light Circuit

Mike,

Here is the running light schematic from my OM.

Regards,

Kevin
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Old 06-30-2009, 07:43 AM   #9
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Thanks, Kevin and Aage.

The exterior lights I was referring to are my running lights. They don't work at all now.
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Old 06-30-2009, 07:55 AM   #10
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Quote:
Originally Posted by mello mike View Post
Thanks, Kevin and Aage.

The exterior lights I was referring to are my running lights. They don't work at all now.
Well, time to get the meter out and check where the current stops, Mike. Of course, you did plug the umbilical into the TV and turn the ignition to the "On", right? Or maybe your TV passes current to the trailer in the "Acc" position of the ignition key. BTW, maybe it's fuses in your TV? Something to check, too...

Anyway, the running lights are on a green wire, the tail lights "look" like they are on the red wire,
and brown and black, I can't tell from the tiny little diagram.

Trailer brakes are on a yellow wire. Are they working?

If none of the lights or brakes are working, I would start by having a really close look at the ground connections...

It isn't complicated wiring, shouldn't be too hard to trouble-shoot. Of course, that sounds a bit like "famous last words", doesn't it?
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Old 06-30-2009, 08:44 AM   #11
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Aage,
When I hook up the TV and turn on the vehicle's running lights, I get no running lights on the trailer at all. My brake and turn signals work fine, but no running lights (when I first noticed the problem, the running lights were very faint, but nothing now). Funny thing is, the running lights worked fine until I broke and replaced one clearance light and until I repaired my tail lights. So I need to check both tail lights and that one clearance light to make sure the grounds are good and that nothing is shorting out.
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Old 06-30-2009, 11:16 AM   #12
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Hey Mike,

The clearance and tail lights should be on the same circuit. If they were/are faint, and then stopped woking, I would guess that weak grounding is the culprit, or possibly a mis-installed bulb when the re-work occurred. I would check the grounds too, and the condition of your umbillical connections as well.

Like Aage indicates, get your meter, or 12 volt test light and start tracing.

Good Luck,

Kevin
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