help trailer wiring not working
Thread Starter
|
Senior User
Joined: Mar 2009
Posts: 206
Likes: 0
From: Saskatchewan CANADA
help trailer wiring not working
tomorrow morning i'm going on a trip and i'm towing my trailer, and i'm crossing the border.
i've been in the garage for about 2 hours trying to figure out what is wrong.
I only have right hand brake lights and signals, nothing on the left.
I have narrowed it down to the truck, not the trailer using a test light.
I have checked all the fuses and they are all good.
What else can i check? the harness looks good, no bare wires anywhere.
i don't know what else to check, i've looked in the owners manual but nothing in there.
Any help would be much appreciated.
i've been in the garage for about 2 hours trying to figure out what is wrong.
I only have right hand brake lights and signals, nothing on the left.
I have narrowed it down to the truck, not the trailer using a test light.
I have checked all the fuses and they are all good.
What else can i check? the harness looks good, no bare wires anywhere.
i don't know what else to check, i've looked in the owners manual but nothing in there.
Any help would be much appreciated.
Laughing Gas
Joined: Aug 2009
Posts: 1,192
Likes: 7
From: Belgrade, MT
Wiring
As nick said, grounding is always a first priority.
My next step would be the connector between truck and trailer. No idea wht you have there, but they get very dirty on the truck side, clean each spade or round hole with a wire brush to get any corosion off.
Next, put your test light or multi meter on each spade on the truck side with left blinker, right blinker, head lights, etc on. you should see power on each spade for each function. If that shows a failure anwhere, time to move forward.
The next harness, IIRC, comes from your trailer plug up to the main wiring for the bed/tail lights, pull that apart, clean, and put a meter on each spade.
This is the spot I fall down, as I have only had my truck for 4 months, I know there is the plug under the dash for the trailer brake, but that shouldnt have an impact on your tail lights.
Grounding is Priority 1 on trailer lights, if that is good, then it has to be a broken wire, rubbed wire, or bad spade connection.
You said you checked the trailer with a test light, have you put power to the faulty light on the brake and tail light posts to be sure the bulb is good?
I'm no diesel mechanic, but I can chase trailer lights with the best of them
Tom
My next step would be the connector between truck and trailer. No idea wht you have there, but they get very dirty on the truck side, clean each spade or round hole with a wire brush to get any corosion off.
Next, put your test light or multi meter on each spade on the truck side with left blinker, right blinker, head lights, etc on. you should see power on each spade for each function. If that shows a failure anwhere, time to move forward.
The next harness, IIRC, comes from your trailer plug up to the main wiring for the bed/tail lights, pull that apart, clean, and put a meter on each spade.
This is the spot I fall down, as I have only had my truck for 4 months, I know there is the plug under the dash for the trailer brake, but that shouldnt have an impact on your tail lights.
Grounding is Priority 1 on trailer lights, if that is good, then it has to be a broken wire, rubbed wire, or bad spade connection.
You said you checked the trailer with a test light, have you put power to the faulty light on the brake and tail light posts to be sure the bulb is good?
I'm no diesel mechanic, but I can chase trailer lights with the best of them
Tom
Hotshot
Joined: Jan 2002
Posts: 17,988
Likes: 207
From: La La Land
Each of the trailer turn-signal outputs from the seven-pin (or four-pin) trailer plug are individually fused.
In your 2000, the left-hand trailer turn/brake lamp fuse is Fuse #1 in the under-hood fuse box. It is a 7.5-amp fuse, should be brown-colored, and is in the front-most, passenger-side-most position of that box.
Disregard the "here" in the this photo:
http://springerpop.net/F350/images/IDMRelay.jpg
Check that one again.
By-the-way, for future reference, the right-hand circuit is on Fuse #3, the one just to the rear of #1.
There are no relays involved in this circuit that could fail, just wires and connectors.
Pop
In your 2000, the left-hand trailer turn/brake lamp fuse is Fuse #1 in the under-hood fuse box. It is a 7.5-amp fuse, should be brown-colored, and is in the front-most, passenger-side-most position of that box.
Disregard the "here" in the this photo:
http://springerpop.net/F350/images/IDMRelay.jpg
Check that one again.
By-the-way, for future reference, the right-hand circuit is on Fuse #3, the one just to the rear of #1.
There are no relays involved in this circuit that could fail, just wires and connectors.
Pop
Thread
Thread Starter
Forum
Replies
Last Post
TrekChick
All Things Towing
25
Oct 19, 2009 10:10 PM
