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Old 03-04-2006, 08:21 PM   #15
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Sorry about that, TV is Tow Vehicle. TT is Travel Trailer. On my unit I have 12 Volts on pin 4 from the TT all the time. I have 12 Volts on the same line from the TV when the key is on. This will charge the TT's batery when I drive down the road. When I shut down my truck the connection is broken by a relay in my truck. This prevents the trailer from draining my truck's battery when parked.
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Old 03-04-2006, 08:32 PM   #16
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electrical problem

so it seems we have the same setup if the TT should have power then there must be something amiss, i can ask lexus but they are not very good at that or put in a diode? what is your advice

david
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Old 03-04-2006, 08:35 PM   #17
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I would ask Lexus.
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Old 03-04-2006, 09:05 PM   #18
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I wouldn't put in a diode. You will get a significant voltage drop.

It almost sounds like you have a latching relay in the charging line to the Airstream that is keeping the circuit closed when you turn off the ignition, but opens up when you unplug the umbilical.
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Old 03-04-2006, 09:08 PM   #19
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electrical problem

what is a latching relay and were do i find it? could it be faulty?

david
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Old 03-04-2006, 09:39 PM   #20
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A latching relay can hold it's position after the current is turned off. These might be used because they don't require continuous application of power to keep them activated. It is also possible that the relay, if you have one, is faulty and the contacts are sticking together after you remove power. I would take it to a trailer electrician.
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Old 03-04-2006, 09:49 PM   #21
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electrical problem

i dont think the 22ccd has one i have the wireing schematic and it doesn't show one, it looks like this problem is not solvable with the info we have , i did contact airstream they blamed the vehicle , lexus blamed the trailer , so whats new, thanks for your help, but i do hope i can get this fixed.

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Old 03-04-2006, 09:52 PM   #22
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The relay would be in the tow vehicle.
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Old 03-05-2006, 09:19 AM   #23
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electrical problem

thanks i will check with the dealer on monday,

david
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Old 03-05-2006, 09:27 AM   #24
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The issue is in the vehicle not the Airstream. It could be a relay, non functioning or the incorrect one. It could be a bad ground. Was the TV set up for 7 pin towing orginally or was it added on. If that is the case the wiring could be suspect. Many vehicles that are "supposedly" set up for towing only come with the flat four connector. That means somebody had to add the extra 3 lines, for brakes, reverse lights, and the 12volt charge line. I know for a fact that the trailer line should be a live feed from the trailer because we use it to turn on the running lights on the trailer when it is parked so people can find us. Also just for fun you can install a heavy duty flasher in the 7 pin female plug and get all of the trailer running lights to flash...PARTY TIME!

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Old 03-05-2006, 11:07 AM   #25
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David----I agree with Aarons thoughts concerning where and when was the Tow vehicle wired for a trailer, factory or dealer and was it originally a 7 pin connector or converted from a flat 4 pin??? After reading the symptoms I would also be suspious of a poor or lack of ground. There should be a ground wire between the tv and tt. The trailer ball should not be the ground path between the two. A quick check of this can be done by--unhook the trailer hitch but connect the wireing plug connector. With the TV running and running lights turned on, place a 12volt test light or better yet a volt meter between the the frame of the trailer and the trailer ball on the TV. There should be no voltage reading on the meter or no light burning if using a test lamp. Another thing that could be done is hook you trailer to a known good tow vehicle electrical system Do you have a friend that tows that would let you plug your trailer into and see if it effects theirs?--Pieman
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Old 03-05-2006, 11:18 AM   #26
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electrical problem

all great advice guys which i shall attempt soon i hope, its raining here.

yes it was a factory installed 7 pin setup it is a lexus lx 470 same as a landcruiser year 2004, ive heard toyota can be funny in these things sometimes.

again thanks

david
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Old 03-05-2006, 07:00 PM   #27
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electrical problem

well guys i managed to check the ground issue and all is well there, also when this malfunction happens my remote door opener will not work, go figure.

thanks

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Old 03-05-2006, 07:56 PM   #28
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Hi All,

I agree with the thought to get it on with Lexus. I just spent 2 hours tracing down a non-operating +12VDC wire at the trailer plug on a new Allegro Bus MoHo after installing a Prodigy. The manufacturer said to call the chasis people, they said it was a build problem.........I am in the middle!!!

Anyway, it turned out to be a bad relay on the MoHo........build problem!

I would suspect that the Lexus has some issues with that connection also. I would get the dealer to verify that all of the wiring and associated components are operating to spec. and also find out exactly where they pulled the +12VDC from. This mighth help a lot in solving the situation .

It might help to do a continuity test of that wire and also verify that it is not shorting to ground ocassionally at some point along it's run. (bare un-insulation wire rubbing the frame every so-often, etc.)
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