No voltage at trailer hook up....help - Ford Powerstroke Diesel Forum
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post #1 of 18 Old 06-24-2014, 10:02 AM Thread Starter
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No voltage at trailer hook up....help

My trailer hookup connector (4-pin type) does not have any voltage output other than the brake light. I measured voltage and all three female pins read 0.02V.


I checked fuse No.13 (trailer hookup) in the fuse box and it was ok....

I use a motor tool to clean the pins on both truck and trailer connectors, no luck...

The truck running light, back up light, blinkers, brakes all work good.

What should I look into? This is a 2000 F250 7.3L

Thanks for your advice
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post #2 of 18 Old 06-24-2014, 11:58 AM
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Check for power at the trailer harness while pressing on the brake.


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2002 F350 CCLB DRW
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post #3 of 18 Old 06-24-2014, 12:12 PM
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I could be mistaken, but I'm pretty sure there are two fuses relevant to the trailer lights on my truck.

Check more fuses. And if that's not it you probably have a short somewhere, so just redoing the wiring and tying into the tail light harnesses would be easiest

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post #4 of 18 Old 06-24-2014, 12:17 PM Thread Starter
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Quote:
Originally Posted by BrodieBiking View Post
Check for power at the trailer harness while pressing on the brake.


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The brake light pin was the only one with voltage output. The problem is with the running light and turn signals.
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post #5 of 18 Old 06-24-2014, 12:18 PM Thread Starter
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Quote:
Originally Posted by Joel View Post
I could be mistaken, but I'm pretty sure there are two fuses relevant to the trailer lights on my truck.

Check more fuses. And if that's not it you probably have a short somewhere, so just redoing the wiring and tying into the tail light harnesses would be easiest
I checked all fuses and none was bad.
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post #6 of 18 Old 06-24-2014, 12:28 PM
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Quote:
Originally Posted by mas360 View Post
The brake light pin was the only one with voltage output. The problem is with the running light and turn signals.
Huh. Here is a pic. Which wire had power. Did you check power with the parking lights on? Flashers?
Attachment 303841where did you ground to?

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Last edited by sbluke55; 04-16-2015 at 09:23 AM.
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post #7 of 18 Old 06-24-2014, 12:33 PM
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My 4 pin connector went bad years ago and I cut it off. Now I use this. Attachment 303849its a 4pin to 7 pin adaptor

01 f-250, Standard
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Last edited by sbluke55; 04-16-2015 at 09:23 AM.
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post #8 of 18 Old 06-24-2014, 12:37 PM Thread Starter
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The middle pin is the one with power when the brake is pressed. The other two had voltage reading 0.02V. I ground the multimeter black probe to the covered pin (ground pin).

Yes, I checked flashers and they were dead. I checked all light bulbs and out of four bulbs three of them were bad.
No, I did not have parking lights on.

I also tried with the 4-pin to 7-pin adapter and the result was exactly same. That tells me the problem is likely upstream, not in the bundle.

By the way this is a boat trailer.
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post #9 of 18 Old 06-24-2014, 12:49 PM
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When I bought my truck (2005) it had same issue, 0.02v If the 7.3 is different, then ignore this post.

Like was said in previous post, there are additional fuses and relays which are under the hood. They are in place to protect the truck lights if a trailer has a shorts or bad grounds. it sounds like you have at least a relay and a fuse blown. after you fix the fuses, be sure to check your boat trailer wiring harness, fuses dont blow for no reason

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post #10 of 18 Old 06-24-2014, 12:50 PM
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The trailer plug fuses under the hood. Your getting power to your left side but not your right that's most likely a fuse under the hood. Turn the park lights on and check the one next to the ground. Easy way to check a fuse is to put your black lead to the batt and touch each side of the fuse while it's plugged in and the key is on. If you don't get power on both sides of the fuse it bad.

01 f-250, Standard
Rev tech 4" lift,35" Mickey Thompsons MTZ
KC diy 66 stage 2, Full force 160/100 and custom tunes from PHP
Banks inner cooler and full 4" exhaust, Diy S&B intake
Diy quad feed, Hydra, Isspro boost, pyro, and fuel pressure
3/0 battery cables with military style terminals
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