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Truck and trailer problem

Post By: fishman1      Posted: 4/14/2019 5:41:50 PM     Points: 19622    
Ok guys, I have a problem. Last fall when we went to Lake Oahe the trailer had a blowout which blew the trailer fender off the trailer. The fender had a marker light on the front and the rear of it. The wire still had the plugs on it. Got a new fender and lights. Hooked the trailer up to the truck and no lights. My name came over with a meter and found with all the lights plugged in the trailer wiring has continuity. Next we checked the plug coming from the truck. No power coming from the truck. Checked some fuses the owners manual listed they were good.
Donít know what else to look at.
 Reply by: xavierk31      Posted: Apr. 14, 6:14:55 PM     Points: 398    
Man, that kinda sucks, only time my old man's truck had any issues the problem was with the actual plug for the lights, once we replaced that it was fine. That's really strange that no power would be coming from the truck. Although it sounds like the issue might be karma for going to fish Lake Oahe, lol.
 Reply by: chucker      Posted: Apr. 14, 6:15:24 PM     Points: 39    
Make sure you check both sides of the fuse. I would get your manual and make sure you are checking the right fuses. I had a similar problem and had to put a bigger flasher in.
 Reply by: FishingJunkie      Posted: Apr. 14, 7:27:04 PM     Points: 1813    
You say: No power from the truck.... So, do the brake lights and blinkers work properly on the truck itself? If so, the problem is in the wires connecting to the end plug. Trace the wires back to where they are spliced to the truck wiring. Redo those connections if necessary.
 Reply by: Ajax5240      Posted: Apr. 14, 7:33:19 PM     Points: 26183    
Depending on the truck, you could have several fuses that are in that circuit. Many have specific fuses for trailer lights. Good question above if all the lights on your truck still work. Try the trailer on another truck. If it works, trailer is the problem, if not.. truck is the problem.

Fuses can be blown and still look good. And can have some small connectivity that fools a meter. Try swapping trailer light fuses for a new/ known good fuse. Check both the fuse box under the hood, and in the cab
 Reply by: fishman1      Posted: Apr. 14, 8:03:09 PM     Points: 19622    
Thanks Guys! The truck lights work fine. That is why I thought it would be a fuse or relay problem. Iíll research all the fuse and relays.

Bill
 Reply by: Eyefishing      Posted: Apr. 15, 3:49:50 AM     Points: 6    
Make sure you check the ground at the plug on both the truck and boat. If thereís no ground none of the lights will work.
 Reply by: Dan Swanson      Posted: Apr. 15, 7:25:31 AM     Points: 1359    
Use a voltmeter or test light at the plug on the truck. Google the pinout for a trailer plug if you need to. That will tell you if itís the truck or the trailer that is your problem.

As mentioned, there could be a separate fuse for the trailer lights. My truck has that. Lights can work on the truck but not at the plug.
 Reply by: masteroftheloch      Posted: Apr. 15, 9:18:14 AM     Points: 149    
check your ground wire coming form the trailer wire harness to the truck. Check for a splice in the trailer wiring coming from the truck and also from the trailer on the boat. most likely a splice or a loose ground wire.
 Reply by: Ajax5240      Posted: Apr. 15, 9:53:06 AM     Points: 26183    
Trailers will usually find ground through the ball connection to the truck as itís all metal. A bad trailer ground wire more often causes flickering/dim lights. With no power present at the truck trailer plug, the issue is likely on the truck side.

Bill, Iím out of town till Thursday.. if you donít have it fixed by then shoot me an email. I can come take a look at it with you. My son goes to school in Windsor so it would be easy to come by
 Reply by: fishman1      Posted: Apr. 15, 2:01:59 PM     Points: 19622    
Thanks everybody.

Brian, Iíll let you know if Iím working Thursday or not.
Thanks.

Bill
 Reply by: masteroftheloch      Posted: Apr. 15, 2:17:17 PM     Points: 149    
I don't wanna argue anything here...lol, but take it from a guy who has owned about 8 different boat and trailer rigs... .90 percent of wiring issues on a trailer is due to a faulty ground.... the other times its either a fuse, or a spliced wire.
 Reply by: Hawaiian Punch      Posted: Apr. 15, 3:20:06 PM     Points: 3427    
Beware of the blue squair wire splicers that come with trailer light kits.The little spade inside it cuts into both wires to make a connection,now you got both wires cut in to half their wire bundle,so your wires are open to failure on many different levels.Just learn how to sodier and heat shrink.
 Reply by: Ajax5240      Posted: Apr. 15, 5:50:26 PM     Points: 26183    
Loch.. while it is always good to have a good ground wire in your trailer harness, and certainly a good ground at your trailer plug... connecting a metal trailer to a metal ball that is attached to your truck serves as a pretty good ground. Unless you are one of the weird folks that insists on greasing your ball.. which could add a layer of resistance to the circuit. Ground is ground.

Try taking a multimeter and measuring the resistance (ohms) between trailer frame and truck frame. Itís not much. Not enough to cause a short by any means as that occurs on the positive side, not ground.

Not that it could never cause a problem... but given the fact that Bill has no power at the light plug on his truck certainly points to a blown fuse..

Not in any way to sound like a ďknow it allĒ but automotive electronics is the only thing I have a college degree in... and ASE master certifications in..
 Reply by: Hawaiian Punch      Posted: Apr. 15, 6:41:07 PM     Points: 3427    
Take Ajax up on his offer.He understands auto electric and that puts him in a class of its own. That S-hit makes me crazy!
 Reply by: fishman1      Posted: Apr. 15, 9:56:46 PM     Points: 19622    
I used a multi-meter to determine there was no power coming from the truck side plug. It is factory wiring also. It has two options for plugs, a flat and a round one. Neither has power. I am definitely hoping I donít have to work Thursday so I can utilize Brianís talents.
I really appreciate everyoneís comments and help on this! Thatís what I love about this site.

Bill
 Reply by: Ajax5240      Posted: Apr. 15, 10:19:25 PM     Points: 26183    
Haha, work Thursday.. I donít land at DIA till like 7p..

Friday or over the weekend I am available. Do some digging around on the fuse blocks in the mean time.

Weíll get you all fixed up! Iíd bet a cold beer or two itís the trailer fuse that got shorted during the blow out. Just gotta check the wiring on the side that had the blowout to make sure the short is fixed so you donít keep blowing fuses.

Compared to cars electrical/computer/sensor systems. Trailers are a cake walk. Especially the ones without brakes.
 Reply by: fishman1      Posted: Apr. 16, 2:25:22 AM     Points: 19622    
Thanks Brian. I'll let you know about Friday.

Bill
 Reply by: Dan Swanson      Posted: Apr. 16, 11:51:03 AM     Points: 1359    
If itís a 2015 Ford F-150. It will have a fuse for the trailer lights. Check that. I had that problem with my 2014 F250. Mine was in the under the hood fuse box.
 Reply by: EYESORE      Posted: Apr. 16, 2:53:50 PM     Points: 180    
I has a similar sounding issue on my Silverado and it was a fuse dedicated to the tail lights.
 Reply by: fishman1      Posted: Apr. 17, 6:35:16 PM     Points: 19622    
Hey Brian, I sent you an email.

Bill
 Reply by: fishman1      Posted: Apr. 17, 6:55:10 PM     Points: 19622    
Thanks Dan. Itís a 2013 f150
 Reply by: A10FLYR      Posted: Apr. 17, 10:40:05 PM     Points: 26    
If it's an aftermarket install there will be a separate inline fuse most likely outside of the fuse box under the hood.


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