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Whats the wire to?

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Old Dec 12, 2017 | 11:10 AM
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Whats the wire to?

Working on the back of my 2000 F250 super duty, see a wire thats not hooked up to anything. Its a single green wire coming off the plug for the lights for the bed. Its not the turn signal light, its for something else. Its capped off from the factory. I don't think I have power to it at any time though. Any idea what its for? Another similar but different question I'll try to add into this on. Where are the wires that pass through the cab for auxiliary switches located in the cab? I know where they are in the engine compartment, but can't locate them inside. Thanks.
 
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Old Dec 12, 2017 | 11:34 AM
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Does it have power when the lights are on? If so it could be for a light inside a bed cap.
 
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Old Dec 12, 2017 | 02:56 PM
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1. Green wire is for center high mount stop light (CHMSL) for use with a camper or other bed cover. If it is still connected correctly it gets a 12V signal when the vehicle stop brake is applied.

2. Pass through wires should be on the outboard side of the brake booster. May be tucked in the harness if they have never been used. In the cab they should be in the general area of the trailer brake controller connector near the middle of the dash towards the driver.
 
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Old Dec 12, 2017 | 04:19 PM
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Makes sense since I can't be behind the truck with the test light and press the brake pedal at the same time. Next thing with the pass through wires, Where can I find the auxiliary switches, if they had them for this year to hook up to that? I'd rather have something that looked factory rather than a switches drilled through the dash or something.
 
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Old Dec 12, 2017 | 05:21 PM
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2005 was the first year for upfitter switches. I made my own set, not too hard to do.
 
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Old Dec 12, 2017 | 05:53 PM
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Originally Posted by farmhick
Makes sense since I can't be behind the truck with the test light and press the brake pedal at the same time. Next thing with the pass through wires, Where can I find the auxiliary switches, if they had them for this year to hook up to that? I'd rather have something that looked factory rather than a switches drilled through the dash or something.
What they invented BFR's for ( Big freakin rock)
Put it on the brake pedal.
 
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Old Dec 12, 2017 | 09:46 PM
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Originally Posted by geekwithoutacause
What they invented BFR's for ( Big freakin rock)
Put it on the brake pedal.
yeah, well usually if the hazards or turn signals work the brake lights work too, So its one of those things that wasn't even a thought
 
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Old Dec 12, 2017 | 11:02 PM
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If you want it to look stock but still be customized to suit your needs, this is one way to do it:
Riffraff Diesel Custom Auto Dash Kit
It replaces the original lower section of the dash with the F650 type lower section. They can customize the switch names for you and configure it however you want it, within reason.
 
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Old Dec 13, 2017 | 06:14 AM
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yeah, well usually if the hazards or turn signals work the brake lights work too
The turns/hazards do not activate the HMSL, only the brake pedal switch does that.
 
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Old Dec 13, 2017 | 08:20 AM
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Originally Posted by projectSHO89
The turns/hazards do not activate the HMSL, only the brake pedal switch does that.
Yeah I get that. I'm used to checking trailer lights older vehicles without the HMSL, and my dump truck so if the hazards work then the bulbs are good basically. And this truck I have my air compressor mounted in the bed so its covering up the HMSL anyways.
 
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Old Dec 13, 2017 | 08:21 AM
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Originally Posted by asdrew
2005 was the first year for upfitter switches. I made my own set, not too hard to do.
Do you have a link to the thread or any pictures of how you might have done it?
 
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