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E-brake red light - where is it? F-250

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  #16  
Old 09-17-2014, 06:57 PM
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20 torn and a 7mm head
 
  #17  
Old 09-17-2014, 07:21 PM
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Originally Posted by LeoJr
This does not work on my '96. I tried the key on a few times, no light. Key on and press the e-brake and the light shines.

I would have bet a dollar against donuts that it would have lit just like you suggested.
Then your brake fluid level switch is bad or disconnected.
 
  #18  
Old 09-17-2014, 07:35 PM
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Originally Posted by subford
Then your brake fluid level switch is bad or disconnected.
Keep talking....

It has had the recall for the brake/cruise control done on it. The fluid level is good. Are you talking a different switch?


Edited to add: You had my curiosity up...I just cycled the key about 10 times and 2 of those times it lit just as you said, the other times it didn't. Something's intermittent...
 
  #19  
Old 09-17-2014, 07:47 PM
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Originally Posted by LeoJr
Keep talking....

It has had the recall for the brake/cruise control done on it. The fluid level is good. Are you talking a different switch?


Edited to add: You had my curiosity up...I just cycled the key about 10 times and 2 of those times it lit just as you said, the other times it didn't. Something's intermittent...
Here is your 1996 wiring for it:


/
 
  #20  
Old 09-17-2014, 09:13 PM
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Now I'm confused...easy to do...this seems to say that the light will be lit no matter what the condition of the two switches are, open or closed, but the light does not go dark if either switch is activated. I have the opposite condition, the light is not lit during the key on warning system. But I may be reading this wrong...

Thanks subford for your patience....
 
  #21  
Old 09-18-2014, 06:39 AM
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Per that schematic from subford, the warning light receives +12V on one side. The other side goes on to the brake fluid level switch, after which it then splits to the ignition switch and RABS module.

So with +12V applied to one side of the bulb, the brake fluid level switch will light the bulb when closed. It will also pull down (ground) the signal circuit going to the RABS module.

The ignition switch being in the START position, and parking brake switch being closed (brake applied) accomplish the same function as well.

So, if you say it works intermittently when you turn the key to START, then you probably have a flaky ground contact in the ignition switch.
 
  #22  
Old 09-18-2014, 07:23 AM
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Originally Posted by GoinBoarding
My light works intermittently (bulb is fine). Figure it's the switch or wiring to it, just don't care about it enough to bother at this time. So I think starting at the switch is a fine idea.
That parking brake switch is the cheapest of the cheap switches I've ever seen. Bet if you take a look at it, the (fully exposed) contact on the plunger has dust and crap built up in it.
 
  #23  
Old 09-18-2014, 07:33 AM
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Originally Posted by dixie460
So, if you say it works intermittently when you turn the key to START, then you probably have a flaky ground contact in the ignition switch.
The other lights, ABS, etc all seem to light consistently with the key on. Does the e-brake circuit have its own contact within the ignition switch?
 
  #24  
Old 09-18-2014, 07:53 AM
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Originally Posted by LeoJr
The other lights, ABS, etc all seem to light consistently with the key on. Does the e-brake circuit have its own contact within the ignition switch?
Yes it does. None of the other lights in the cluster have a prove out ground from the Ignition switch.
 
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