Wiring Problem

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Apr 9, 2021 | 06:52 PM

DOGSINIT

Thread Starter

Freshman User

Joined: May 2008

Posts: 25

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Wiring Problem

I have been trying to find an electrical problem in my 2016 F250.

My parking lights, rear tail lights, left backup light and license plate lights don't work.

I have checked a bunch of fuses but unable to find the problem.

Any Ideas?

Apr 9, 2021 | 09:02 PM

masonlift

Mountain Pass

Joined: May 2012

Posts: 208

Likes: 103

From: Abbotsford

If fuses are good I’d be checking headlamp switch. Backup light probably not related,I’d check that bulb but all the other lamps should share same circuit

Apr 10, 2021 | 07:21 AM

RV_Tech

Hotshot

Joined: Jan 2010

Posts: 10,060

Likes: 491

From: Bristol, TN.

When you say "a bunch of switches", just to clarify, you used the owner's manual to identify the fuses involved and all were good? Did the lights all fail at the same time?

Steve

Apr 11, 2021 | 03:47 PM

DOGSINIT

Thread Starter

Freshman User

Joined: May 2008

Posts: 25

Likes: 0

Here is what I did to try to find the problem:

With the trailer connected to the truck and trailer 7 pin connected to the truck.

The trailer and the truck turn signal and brake lights work on both the trailer and truck.
While connected to the truck, I connected an additional battery to the tail light wiring on the trailer.
The trailer tail lights light up ----- but the tail lights on the truck do not. THIS MAKES NO SENSE TO ME.

My thought is if it is a blown fuse in the truck, the truck tail lights should light up with the trailer tail lights.

Is there something in the CAN BUSS system that prevents it?

Any thoughts?

Apr 11, 2021 | 04:29 PM

Simon Espinola

Mountain Pass

Joined: Jan 2021

Posts: 185

Likes: 4

From: Somewhere in the universe

You should check the wiring harness thaat goes to the back of the truck, visually check it, test each cable, in my 04 it goes straight from a junction point at the driver-side wheel well, goes straight in the driver side frame rail, not sure what the 16 has but check your cables