By the way, I've looked all over for pin outs of this unit. I found a diagram of a 12 pin unit and a 3 or 4 pin, but mine is six. Anybody know where I could find one of those?

AllData and Mitchell have nothing for it?!

 

Check the switch on the parking brake assembly, either the wire (I think it is purple with a white stripe with a female spade connector) has popped off, or the switch is corroded to loose the grounding, or the plunger spring/contact is jammed. Touch the wire to a good ground to see if the brake light comes on.

 

Thanks alot! Will do.
Never really messed with it because I didn't think that was the problem. But I'm gonna check into it. I hope it fixes it because that Vulcan wrecker bed runs soooo slow. I need to idle it up.

 

**Update**

Well, I finally got around to checking out the brake switch. The switch was unplugged. So I plug it in, but STILL no brake light??

I've looked in the 5 jillion owner's manuals that came with this truck, and every illustration is lacking a parking brake light. There's a brake warning light for the hydraulic system, but I can't seem to find any light for the parking brake.

With that being said, can anybody confirm whether this mythical light exists? If it does, where is it located?
If it doesn't exist, what in the world is the wire for?

By the way, AIC/APCM still will not idle up the truck.

Anymore info would be greatly appreciated.

 

Only to try and answer the illuminated BRAKE light on the dash, I have a 93 Ford with a stick and the brake light is in the bottom left corner of the dash. Now on my 97 PSD(it is also a manual) I dont have a BRAKE light either. I have shined a light on the dash in such a way you can see all the light indicators such as check engine and what not and I really dont believe that it has a BRAKE light. But I do know if you have the parking brake applied it will not allow you to set the cruise control. Yes i know because the brakes were backed off so far that I was able to walk through the parking brake and haul *** down the road....trying to figure out why the cruise wouldnt work. I tell yuh what, you'll never see a man reach for the brake release any faster than that right there HAHA! Long story short that may be what that wire is for on the parking brake. Not to just illuminate the dash BRAKE light.

 

the red "BRAKE" light? It indicates hydraulic warning, low vacuum, and parking brake. Try putting the truck in neutral, foot off clutch, and turn the key to start. The Light is located bottom right, below tach, and should glow in "start" If not, check the bulb. also check on your rad support driver's side behind bumper if the DRL module (DRL) or bypass jumper (non-DRL) came unplugged. The parking brake wire goes in and out of the Daytime running light connector. I found this out when I disabled my DRL's when I installed my HID headlights and my parkbrake light stopped working.