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Old 09-01-2018, 07:10 PM   #21
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I believe my '79 has these wires you describe, but I haven't sorted it out yet to figure out which is which. It's definitely wired differently than newer Sunlines.
Jon,

If your 79 has some of this, maybe it can help add to the mystery wire.

First off, does yours have this tank panel and by odd chance any brand name and or model number of the tank panel? If we have some kind of brand at least, we can try a web hit on see if we can find some info on it.



What wiring setup does yours have on the 7 wire cord and the battery connection? Any pics?
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Old 09-01-2018, 08:14 PM   #22
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the black flex conduit contains all 7 of the trailer wires. They are all connected and all trailer towing lights/brakes work.

The 4 wires in the photo lead back to a point under the control panel in the picture above. the blue wire connects to the brake-away brake thing to lock the brakes if the trailer becomes disconnected from the tow veh.

I couldn't find any label or name on the control panel. Even checked the back side and found nothing to ID it.
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Old 09-02-2018, 06:51 AM   #23
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I couldn't find any label or name on the control panel. Even checked the back side and found nothing to ID it.[/QUOTE]

Did you determine that red wire actually came out of the monitor panel? I dont suppose the wires are labeled at all where they come out of the box? I'm still thinking that it was attached to a probe for battery water level. That would explain why they ran a wire to the battery area instead of to the fuse panel. I'm guessing the battery level gauge still works without that wire attached?
Gary G
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Old 09-02-2018, 08:55 AM   #24
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OK it appears to have a momentary "read" switch this probably operates the meters I just can't see any reason they would leave a light on with battery constant power it's bad enough that a gas detector will kill a battery left on long term. So whatever those lights are for my guess is they are connected to the switch and only are used when the switch is applied. Do the meters work at all? Also they would not run a #8 wire to a tiny meter again my guess is it is supposed to go to the converter/charger. Here is the deal I am about a hour from you one of two things you can bring the trailer or I can come to you it's no big deal I am retired and enjoy a wiring mystery. I was the electronics tech for the Cumberland County facilities dept for 15 years my office was right inside the jail in Portland if it had wires I had to deal with it from DC to 480.
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Old 09-02-2018, 07:15 PM   #25
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OK it appears to have a momentary "read" switch this probably operates the meters I just can't see any reason they would leave a light on with battery constant power it's bad enough that a gas detector will kill a battery left on long term. So whatever those lights are for my guess is they are connected to the switch and only are used when the switch is applied. Do the meters work at all? Also they would not run a #8 wire to a tiny meter again my guess is it is supposed to go to the converter/charger. Here is the deal I am about a hour from you one of two things you can bring the trailer or I can come to you it's no big deal I am retired and enjoy a wiring mystery. I was the electronics tech for the Cumberland County facilities dept for 15 years my office was right inside the jail in Portland if it had wires I had to deal with it from DC to 480.
Hi Mainah........The battery charge meter works when you move the rocker switch to the "read" position. The "pump" LED lights when you move the rocker switch to "pump". The "battery"LED only goes out when I leave the mystery red wire connected to the battery positive terminal. Haven't seen any sign the holding tank LEDs work or that the fresh water meter works.
That's a generous offer to take a look at my camper. I appreciate it. I haven't had a chance to check the wheel bearings, so I'm afraid to tow it.
If you want to come to Brunswick and take a look, I would be willing to pay you for your time. This is my first travel trailer so I'm learning as I go. I just tested the water heater and furnace today and both work well, although there's very little hot air flow to the rear. I'm thinking the ducting may be the issue.
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