Here's the symptoms: turn signal, reverse lights, and o/h display are out. All other lights, including flashers, work. Also the ac is blowing out of the defrost vents. That may be a different problem, but where to start?

 

Sounds like you have a blown fuse. On the '02 trucks and later I believe it is fuse 27. Not sure on the older trucks. Check your fuses.

 

Your AC blowing out of the defrost is most likely caused a vacuum leak. If you have auto locking hubs the vacuum lines running to the hubs are known to get dry rotted and start leaking.

 

It was fuse 27. I was confused because its labelled in the owners manual as "ignition on" or something like that. No mention of turn signals. It also had a 15a in it instead of 20. A/C works right again too, but good to know about the dry rot on vacuum hoses, I'll have to check them out.

 

I think that fuse powers the vacuum pump also.

 

I replaced fuse 27 with a 20A and everything's been fine - until today. Came to work this morning and when I went to back in a spot, white smoke started coming out from behind the fuse block. It stopped after I shut the truck off. I pulled the fuse block and the 4th plug from the right on the bottom was a crispy critter. It's got a larger gauge pink wire (I assume that's power in) and several others, orange/gray, blue/pink, black pink, black/green plus a few more. If anyone has a wiring diagram of the fuse block it would be greatly appreciated. It's also concerning that the fuse did not blow, maybe that's why the PO had a smaller fuse in there? The melting occurred at the plug face where it contacts the fuse block, wish I could post pics.

 

What year is your truck?

 

Innocent Bystander,

Check your email. I sent you a link and the User ID and Password to log into EBSCOHost. You will find what you need in the Auto Reference Repair Center.

 

truck is a 2002 SD Lariat. Thanks for the link, I'll check it out.

 

Go to my site and click on the link to open the wiring manual. That will have everything you need.

https://sites.google.com/site/woodnt...uty-electrical

 

First of all, many thanks to woodnthings and paysonpsd for your help and schematics. Here's where I am now: after my fuse block fried, the reverse lights, running lights, and overhead console computer didn't work. I located another fuse block and replaced it. All that stuff works now, but now I have no power windows, interior lights, radio, and no instrument cluster. All the fuses are good and are the correct rating per the owner’s manual. The original fuse block (officially it's Central Junction Box) is part #2CT7-14A067-AN and the replacement is PM2CT7-14A067-AN, both out of ’02 CC F250s, and all the pins in the back matched. I’m pretty sure the radio, lights, and windows are related to the power saver relay, but the cluster isn’t. I’m still tracing circuits, but do I maybe need to get the VSM reprogrammed?