Trailer Plug - Left blinker wire is dead

[Lindenberg]

Where do the blinker wires go from the 7 pole trailer plug on the rear of 2000 Alpines? Do they run all the way up to the front of the coach or are they connected to the blinker wires at the tail lights?

The yellow left blinker wire that is connected to the 7 pole trailer plug on the rear of my 2000 Alpine doesn't have any power to it. The left blinker on the rear of the motorhome does blink so I suspect my problem is a bad connection.

[Lindenberg]

Where do the blinker wires go from the 7 pole trailer plug on the rear of 2000 Alpines? Do they run all the way up to the front of the coach or are they connected to the blinker wires at the tail lights?

The yellow left blinker wire that is connected to the 7 pole trailer plug on the rear of my 2000 Alpine doesn't have any power to it. The left blinker on the rear of the motorhome does blink so I suspect my problem is a bad connection.

[Old Rv'er]

I suspect you are correct, and 8 years old is a long time, so it also could be corroded, and all of them might be loose. Take a big piece of cardboard and put under the work area, this is to catch those pesky little screws you will drop. To check those connections at the plug, you will have to take it apart. Find and remove the screws (two I think) holding the inside part from pushing out, by holding all the wires at the back (where they go into the plug), push them toward the front of the plug, and it will/should come out of the housing. Now you can easily see which and what the problems are. I would use a 12v test light before I put it back together to make sure all is working first. This should fix it. Once you figure it out, and fix it, then put Vaseline petroleum jelly on all the exposed connectors and then put it back in. This will help keep it waterproof and it won't corrode again. If it has shorted out, you might have to cut out the bad part, and splice in enough extra wire to make the lengths correct before you put it back together. If this is the case, I would use a little piece of Scotch 23 Rubber tape, and then a little piece of Scotch 88 electrical tape to make that splice waterproof. Then after you have it fixed, tape over the whole wire bundle for about a foot or so, it helps keep additional water out of the thing. This is a time consuming fix, but not rocket science, unless you are not versed in electrical things, then get a friend who is, they can help you.

[Lindenberg]

Well I got it working again. The yellow 1003 wire running down to the trailer plug was dead. It is joined to the wire that runs to the tail light someplace. There is a single yellow 1003 wire coming out of the 40 pin cab/chassis connector so this single wire must split near the left tail light.

[rmmpe]

As stated, it probably is the connector at the rear.
However, if you ever lose power to a rear turn signal, remove the left-front kick-panel under the dash board where you will find a connector at the end of the wires coming from the steering column. The connector on mine was not fully inserted and the right-rear signal recently stopped working (trailer connector as well).

The strange thing was the right front signals worked but the dash indicator and rear did not. Surprisingly (to me anyway), they are all completely seperate circuits (green = right, yellow = left).