Timjame0719

I'm not sure but I think if the switch was bad I would still have a brake light and also my trailer turn signal works.

Ok I will certainly not rule a thing out. It has me stumped.

I checked and the third brake light works fine so it's still just the left brake light/turn signal.

Will try thanks. I thought that light worked but will check.

Ok I tired to search a bit for this in the forums and internet and I just can't find the same situation I have going on to compare. A few weeks ago I noticed the left turn signal (and brake light being the same filament) was flashing fast so I thought I just had a light out. The front left turn signal worked but flashed fast and I had no rear tun signal or brake light. I drove it another day and it came back on. So for the next week and a half it was on and off with no apparent deciding reason. I didn't immediately do anything until finally it went out and never came back on. I checked fuses and bulb, no dice. I hooked up my boat and that turn signal worked just fine (although flashed fast)......this is what was different. Seemed that most with the turn signal being out didn't have a turn signal on their trailer either but I do. I pulled the bulb and socket out and tested the end of the wire plug that plugs into the socket and compared to the other side on brake and turn signal I'm getting half the voltage to it which I'm guessing is why it isn't working. I didn't think the ground is bad as the tail light works on that side, just not the turn or brake. Any ideas on what could be going on? Thanks for any help!!

Great information from everybody! Thanks very much for your time here. Hopefully there won't be another time like this on that rock as I am removing it in the spring but with my luck soon I will see if I can master that technique!

Gotcha thanks. Does it matter if I'm on the freeway and the hubs are locked manually but dial is 4x2?

Now that makes sense to me. Manually turn the hubs when the auto seals are bad. The dealer told me use the dial when roads are snowy but the hub locks are for when you are "really stuck". That made no sense at all to me. Thanks everybody!

That makes sense. Frustrating to say the least but it was my fault to begin with I guess. I will certainly be looking at upgrading that system then. What's the difference between using the dial with hubs in auto or locking the hubs out? I noticed no difference.

Hello all, new here and fairly new to the Super Duty. Although I had a 2000 F250 a long time ago, the 4x4 system never properly worked but now that I'm back to the super duty I have a few questions on the operating system of the 4x4. I bought a pretty used 2007 F-250 super duty CCSB with the 6.0 PSD. I know all about the 6.0 weaknesses and they have been addressed but when I got it I noticed the 4x4 wouldn't engage with the switch in the cab. I have auto hubs no manual stick inside. I knew from my last one that the seals in the hubs were probably bad. So I had the Ford dealer I bought it from replace the seals. The 4x4 engages immediately from a stop or on the fly no problem now with hubs in auto position and cab dial on 4x4. But, here's what happened yesterday and maybe somebody could help me understand why this happened..... I have a long driveway with a hill and we had 6+ inches of snow in it unplowed. I had family following me up the driveway in a new Ford Explorer front wheel drive. They got stuck at the bottom but I was in 4x4 with my hubs in auto position and cab dial to 4x4. The 4x4 was engaged just like it should be and pulling me right up the driveway. I noticed they were stuck so I turned around (still engaged in 4x4) in my yard to come back down and help. I didn't see the snow covered rock that was in the yard and as luck would have it I drove up on it and beached the front right portion of the axle on the rock. My front right tire was off the ground and my right rear tire was barely touching the ground. I tried to back off it but the only wheels that were spinning were my front right one that was off the ground and right rear one that was barely touching the ground obviously not enough traction to pull me off. I thought if I locked out the hubs I could get the front left that was well on the ground to spin. No dice. Seemed to me locking out the hubs never changed a thing and I could never get any other wheels to get power. Even tried 4x4 low. Nothing. I had my neighbor pull me off with his JD tractor. My question is why did the left front and rear tires never get power? I was in 4x4 mode when I hit the rock so they were all engaged when I hit it so it wasn't like it didn't have a chance to lock in. My neighbors chevy did the same thing in the ditch where one wheel was off and same side barely on and all his wheels spun at the same time enough to get him out. Any explanation would be helpful! Thanks in advance!