whacky elec prob
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Senior User
Joined: Jan 2007
Posts: 156
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whacky elec prob
2008 F250
drove this am to work. left AND right directionals were blinking fast like a bulb is out.
no tail lights when head lights are on (left AND right)
no brake lights when head lights are on
with head lights off everything works
any ideas?
ground wire?
faulty switch?
drove this am to work. left AND right directionals were blinking fast like a bulb is out.
no tail lights when head lights are on (left AND right)
no brake lights when head lights are on
with head lights off everything works
any ideas?
ground wire?
faulty switch?
Elder User
Joined: Dec 2004
Posts: 819
Likes: 3
From: Putnam Valley, New York
Rear Lamp Problem
That definitely sounds like a grounding problem at the rear of the truck. Hopefully you have the EVTM manual for your truck. That will show where the grounds are for the tail lamp assemblies. On my 2003, both tail lamp assemblies (stop/turn/tail/backup) share ground #G400, which on my truck is located on the left frame rail near the rear wheel. I have heard that on later trucks (maybe yours), G400 is located on the frame crossmember above the spare tire. Let us know what you find.
RON
Laughing Gas
Joined: Jan 2005
Posts: 1,142
Likes: 25
Definitely sounds like a ground issue, I had an old chevy short box that wouldn't shut off when parked if you put trans in reverse with your foot on the brakes. It was back feeding through the accessory circuits and feeding the ignition because the box had lost it's ground.
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