I have the Abs light and brake light on and also have no brake lights. my blinkers hazards and tail lights still work. also there are no codes so i am confused on where to begin looking to fix the problem. also i was wondering where i could find a wiring diagram for my truck? any help would be appreciated.

 

You could start by replacing the brake light switch.
I paid $12 for one a Napa last month.

 

As for the brake and ABS light, check your Master Cylinder, when the rear brake line rotted out on both my 97's I had the Brake and ABS lights and a hole in the line. You really couldn't tell you had no rear brakes........

 

I forgot to add that my speedo isnt working also??

 

sensor on trans and funny looking fuse under hood i fuse box, the same thing happened to me sensor went bad blowing little sqaure fuse and after replacing fuse speedo wouldnt work till after 20 mph and thats how i found bad sensor on diff.

 

Very important symptom.
ABS depends on communicating the vehicle speed as compared to each tire's speed.
Start by checking wiring or replacing the vehicle speed sensor on your tranny or transfer case if 4wd

 

Based on your last symtom, I would change the sensor in the rear differential. These are the same symtoms that I had when mine went bad.. Not sure what it is called, but there are several post about it.. That is how I was able to figure it out.. Quick fix, and relatively inexpensive compared to other things.

Godd luck. and let us know which fixes the poblem..