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Those blasted trailer brakes

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rrlund
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PostPosted: Sat Oct 19, 2013 11:28 am    Post subject: Those blasted trailer brakes Reply to specific post Reply with quote

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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Old Roy
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PostPosted: Sat Oct 19, 2013 11:39 am    Post subject: Re: Those blasted trailer brakes Reply to specific post Reply with quote

the hot pin is on the truck ? should be for charging batteries on camper if pulling a camper

You should still be able to use the same wiring for a utility trailer that pin is omitted when the male plug is wired correctly, from trailer to truck.
 
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Old Roy
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PostPosted: Sat Oct 19, 2013 11:44 am    Post subject: Re: Those blasted trailer brakes Reply to specific post Reply with quote

sorry couldn't edit
Match up
your plug

 
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rrlund
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PostPosted: Sat Oct 19, 2013 11:46 am    Post subject: Re: Those blasted trailer brakes Reply to specific post Reply with quote

The pin is hot in the truck,yes. I figured it might be for interior lights in a trailer or something,like a dome light in the stock trailer.

I can't figure out why the turn signal started working when I fixed that wire though? Coincidence? I moved something else and it started making contact while I was messing with it?

Doesn't make sense that it would feed to a ground somewhere does it,and complete a circuit?
 
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rrlund
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PostPosted: Sat Oct 19, 2013 11:47 am    Post subject: Re: Those blasted trailer brakes Reply to specific post Reply with quote

Thanks. I saved that to favorites since I don't think this saga is over with yet.
 
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rusted nuts
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PostPosted: Sat Oct 19, 2013 12:06 pm    Post subject: Re: Those blasted trailer brakes Reply to specific post Reply with quote

My thoughts on why the turn signal started to work after you fixed the other wire are, Because you moved the wire around that go to that turn signal. I think all the wires in the plug need redone if you have been pouring coke in there to get them to work in the past, They are all going to need redone, Could be why the brakes don"t work also. I know that is where I would be looking.
 
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rrlund
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PostPosted: Sat Oct 19, 2013 12:24 pm    Post subject: Re: Those blasted trailer brakes Reply to specific post Reply with quote

I did replace the plug. I said that at the end of the original post. No more Coke.
 
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rusted nuts
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PostPosted: Sat Oct 19, 2013 12:27 pm    Post subject: Re: Those blasted trailer brakes Reply to specific post Reply with quote

Oh, Ok, Missed that, Dang, That makes thoughts on on it back to 0
 
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RayP(MI)
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PostPosted: Sat Oct 19, 2013 1:10 pm    Post subject: Re: Those blasted trailer brakes Reply to specific post Reply with quote

rr - We've been having fits with lighting on wife's utility-cargo trailer that wife uses to haul wool products to fiberfests. Replaced plugs, wiring, etc. Seemed to work OK with my car, not hers. Crank up camper was the same way. Plug in LED tester would show good at the adapter plug (round 7 to flat 4) every time. On camper, I ran a separate ground from frame of trailer to trailer hitch mount on car. Worked some better. Was sure I had a grounding issue. Which I did... Finally took factory connector off the bracket on the car. Turns out that it is an adapter, to ANOTHER connector plug in the wiring harness. Got it apart, cleaned up the one corroded looking connector in the bunch, put some corrosion resisting grease in it and it seems to be working OK. I would sure do a real serious check of grounding. Even to running a separate frame to frame ground wire - just to ssee what happens. Good luck, neighbor.
 
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RalphWD45
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PostPosted: Sat Oct 19, 2013 1:24 pm    Post subject: Re: Those blasted trailer brakes Reply to specific post Reply with quote

Roy! that is toooo much information. Sure is a colorful sheet though. I hope rrlund is better than me at reading wiring diagrams. I am somewhere between dumber, and imbecel level. Can't spell good either.
 
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Kornfused
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PostPosted: Sat Oct 19, 2013 1:38 pm    Post subject: Re: Those blasted trailer brakes Reply to specific post Reply with quote

Randy, I think Ray hit on it with the plug/wiring on the truck. I had to tear mine out (99 Chev), clean it all up and shined up the plug and the frame for good conenction. All the road dirt gets thrown up against there.
 
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jon f mn
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PostPosted: Sat Oct 19, 2013 1:43 pm    Post subject: Re: Those blasted trailer brakes Reply to specific post Reply with quote

rrlund here is my phone number. Call me and I'll walk you through a diagnostic of your brake problems. You are getting mostly good advice, but if you don't follow a logical step by step process you will never isolate your problem. I will walk you through the whole thing from front to back and figure out what is wrong. It will take about 30 minutes and you will need a test light, jack, and battery or battery charger. If you use a battery charger it needs to be an older one with the analog gage and not one of the new electronic ones with a digital readout, they don't work unless they sense a battery. I have the day off and can do it today if you like. My number is 320-492-9077. If you don't want to do it today then call me most anytime. I can talk while I'm driving so unless you catch me while loading or unloading I can usually help.
 
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dpendzic
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PostPosted: Sat Oct 19, 2013 2:30 pm    Post subject: Re: Those blasted trailer brakes Reply to specific post Reply with quote

hot wire n a 7 pin trailer hookup is for accessories or to keep the breakaway battery charged on a utility trailer.
 
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waltdavies
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PostPosted: Sat Oct 19, 2013 3:33 pm    Post subject: Re: Those blasted trailer brakes Reply to specific post Reply with quote

If you have a truck with European lights then there is a converter under the rear bumper that converts it back to the old American system for trailers. These go bad and have to be replaced now and then.
Funny on my friends truck the hot wire go on and off with the key switch his running lights would not work from the plug on the truck so I wired them up the to the hit line. Not what we need but when in a hurry in a storm any old port will do.
Walt
 
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Buddy
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PostPosted: Sat Oct 19, 2013 4:13 pm    Post subject: Re: Those blasted trailer brakes Reply to specific post Reply with quote

I believe the one wire that stays hot in the plug on late model vehicles is for pulling trailers that is equipped with anti-lock brake systems. These trailers require a hot wire to feed that system at all times.
 
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