Posted by rrlund on October 19, 2013 at 12:28:34 from (220.127.116.11):
Question. Why is there a pin in the trailer plug receptacle that is hot all the time and what is the relationship to the turn signals?
I hooked on to that trailer yesterday to finish up what Royse and I started two weeks ago,that being soldering all the connections that weren't soldered from the factory. When I hooked on and checked things,I had no left turn signal. GREAT! One more thing to mess with. I had no power to the pin in the connector on the truck,so obviously a problem in the truck wiring.
I soldered all those connections,didn't seem to help much with the brakes. To heck with it,not going to mess with it anymore. I backed off the adjusters that Royse will attest to,I had tightened up so tight we could barely turn the wheels. I got the test light,turned on the left turn signal and slid under the truck. Right off the bat where the trailer wiring is spliced in to the truck wiring along the frame,I found a wire that,right next to a splice,was skinned and green. I tugged just the slightest little bit and it broke right out of the splice,lots of green corrosion fell out. I cut it back behind the connection and stuck the test light in and thought I'd get a flashing light. Nope,stayed on steady. Thing is,it's on whether the key is on or not. Just constant power to it. No flashing.
So I spliced in a new piece of wire,it started raining and just to humor myself I walked back and looked. The turn signal was working. I'd hoped for a miracle with the brakes,but not really. They will stop the truck now when it's rolling down a gradual slope. I tried it,then backed up,tried again without activating them with the lever on the controller and it rolled right past where it had stopped. Tried a couple of times. I have a little bit of drag that I can feel,but still it won't stop the wheels unless I run over a dip in the driveway. I didn't jack it back up and have anybody hit the brakes while I turned them by hand to see if I could feel an improvement that way.
A little aside,for the last year,when I hooked on and did an inspection,if the left turn signal didn't work,the brakes didn't. I found out that if I'd pour a little Coke in the trailer plug,shake it out then plug it back in,the turn signal and brakes would work. That is until recently when the brakes pretty much gave out entirely. And yes,I put a new plug on the trailer a few weeks ago when I first started messing with this thing and both turn signals worked after I put the new plug on.
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