For some reason the 15 amp fuse in slot #27 keeps blowing. This fuse controls the electric shift, backup lights, daytime running lights, transmission control shift and vacuum hub lock. I've noticed it just recently after switching to 4WD. Has anyone else had this issue? Any resolutions?

 

Obviuously, it could be anything on that fuse. If yours is an automatic truck, I would look at 1 common problem area first:

Transmission Control Switch AKA O/D Cancel Switch. The wires to the switch may have chafed through. Pull the plastic trim off the top of steering column and inspect the two black wires where they exit the hollow shift lever.

 

I had a similar problem but my fuse was the 10 amp in position 2 for a 2002 Ford Ranger 2wd.At first my fuse would blow about every 2 or 3 weeks.I replaced the blower motor and blower motor relay switch.No luck from those.And then recently the fuse started to blow when I moved the shift lever.Ah,maybe it was the overdrive switch wires.Yes,it was.I disconnected the overdrive connection under the dash.The fuse didn't blow anymore.I might rework the overdrive wires later coming out of the shift lever but you can disconnect the circuit under the dash.It stays in overdrive but I don't tow anyway.

 

Oh man, i almost couldnt go without the OD switch. i use it, (depending on the situation) for slowing down, coming off the interstate sometimes, awesome feature.

 

Yup, it is very nice for that. Would be even better having a full tiptronic-style shifting on them as well, especially for towing. LR

 

Thanks for the info. I noticed that when in 2wd and i peel out on snow the # 27 fuse blows. Four wheel works fine just when i peel out fuse blows. Could it be the electric shift,trans control switch blowing the fuse or a short in my drl or back up lamps these are all on the same fuse #27. If so how do i go about checking for a short ?

 

Update: I did take off the steering coumn trim. "rwenzing" you were 100% correct. The black wire had copper exposed from chafing. I taped it up and so far so good. No more blown fuses. Thanks for the help!

 

I changed out my vacuum hubs for manual rugged ridge. I plugged off the vacuum lines but not the central vacuum port. Would a leak have something to do with the 27 15amp fuse blowing?