Lights gone crazy
Thread Starter
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Cargo Master
Joined: Feb 2002
Posts: 2,414
Likes: 22
From: Tucson USA
Lights gone crazy
This morning when getting ready to leave I noted the tail lights were very dim. I had been running in the auto mode so I put them to straight on/off with no change. I tried the Turn sigs and they went beserk, everything went to a dim 4 way (to include the 3d light), the license plate lights flashed etc. When I turned the lights off everything was fine. I tried to drive, but neighbor came out and told me I had no tail lights, so I parked the truck, got the ranger and went to work.
When I got home I went out and everything was as they were this AM. I unplugged my brake controller with no difference. I am scheduled to take it in for oil change so I will leave for them to figure out.
Anyhow anyone else ever had this happen?
04 CC F350 FX4
Hank
When I got home I went out and everything was as they were this AM. I unplugged my brake controller with no difference. I am scheduled to take it in for oil change so I will leave for them to figure out.
Anyhow anyone else ever had this happen?
04 CC F350 FX4
Hank
Former Vendor
Joined: Mar 2004
Posts: 4,362
Likes: 3
From: Hendersonville, NC
Originally Posted by Hank85713
This morning when getting ready to leave I noted the tail lights were very dim. I had been running in the auto mode so I put them to straight on/off with no change. I tried the Turn sigs and they went beserk, everything went to a dim 4 way (to include the 3d light), the license plate lights flashed etc. When I turned the lights off everything was fine. I tried to drive, but neighbor came out and told me I had no tail lights, so I parked the truck, got the ranger and went to work.
When I got home I went out and everything was as they were this AM. I unplugged my brake controller with no difference. I am scheduled to take it in for oil change so I will leave for them to figure out.
Anyhow anyone else ever had this happen?
04 CC F350 FX4
Hank
When I got home I went out and everything was as they were this AM. I unplugged my brake controller with no difference. I am scheduled to take it in for oil change so I will leave for them to figure out.
Anyhow anyone else ever had this happen?
04 CC F350 FX4
Hank
Senior User
Joined: May 2003
Posts: 248
Likes: 0
I had the same problem
I had the exact same problem on my 6.0 PSD CC F250 with a build date of Mar. 03. I went to the Ford dealer and they checked out the truck and said they couldn't find anything wrong. I drove home and went in the back yard and found a bunch of rings in the grass. Then my neighbor came out and said he saw a bunch of aliens in a UFO. I think it was just interference from the space craft, because the problem hasn't repeated. 
Posting Guru
Joined: Aug 2004
Posts: 1,011
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That's the classic symptoms of a bad ground - the voltage seeking a ground through one light (say a taillight) has to go through lots of other lights and things instead. If I knew where the grounds were for the pickups, I could give you more specific advice. (When a similar thing happened on our '89 Suburban, it was a ground ring behind the taillight cluster. They just used a big sheet metal screw into the body metal, and the line worker that day had cranked down too hard and left it spinning in the hole. Eventually it corroded enough to stop making contact.)
Duncan
Duncan
Thread Starter
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Cargo Master
Joined: Feb 2002
Posts: 2,414
Likes: 22
From: Tucson USA
Lights gone crazy UPDATE
Well got the truck back tonight, they said that a turn signal relay, not the flasher has gone bad and that was what caused the problem. I understood the one guy to say a bad light switch, but when we ran the computer listing it came out as a relay of some sort. About a $15 part. 
