Which wire is the parking brake? - Diesel Forum - TheDieselStop.com
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1999-2007 Upgrades and Aftermarket - General Upgrading or adding OEM or aftermarket equipment to your 1999-2007 Super Duty. Please confine discussion of topics in this forum to those items that are not engine-specific.

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Old 12-16-2006, 09:37 PM   #1 (permalink)
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Which wire is the parking brake?

I am installing a Jensen 9021TS in my truck and I don't know which wire to connect the parking brake wire to. Does anyone know which wire is the parking brake wire? I looked at the parking brake switch and found the wires, I just don't know which one to connect to.

Any help would be appreciated.
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Old 12-16-2006, 10:45 PM   #2 (permalink)
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Re: Which wire is the parking brake?

There is only one on the parking brake.

wells
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Old 12-16-2006, 10:58 PM   #3 (permalink)
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Re: Which wire is the parking brake?

Actually, in either 03 or 04, they started using two wires, one ran to a separate grounding point, instead of grounding through the park brake control assembly. IIRC, the Light blue/red trace wire is the one you want to tap into for the radio.

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Old 12-17-2006, 05:02 AM   #4 (permalink)
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Re: Which wire is the parking brake?

is that for a dvd? i just used a switch that I grounded to one side so I could switch on the dvd when I wanted to
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Old 12-17-2006, 07:57 AM   #5 (permalink)
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Re: Which wire is the parking brake?

Thanks. My truck is an 04 and the parking brake has two wires. I used a prob to see which wire lit up when the switch was thrown but neither one did. So I didn't know which one to use.

The Jensen head unit has a hidden menu that gives you the option of bypassing the parking brake feature. I figured I'd wire it as instructed and then bypass using the menu. This way I can change it back, if I have to, without any re-wiring.

Thanks for the help!
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Old 12-21-2006, 10:47 PM   #6 (permalink)
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Re: Which wire is the parking brake?

LOL. How much good is a DVD system that you can only watch when the emergency brake is applied anyway!?! Personally, I can't make my daily commute without cracking up to ELF while eating my cereal and talking on my cell phone while checking email on the laptop on the way to work... Just kidding folks. [img]/ubbthreads/images/graemlins/smile.gif[/img] But my DVD is wired to use. Anytime. Brake or not.
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Old 12-21-2006, 11:32 PM   #7 (permalink)
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Re: Which wire is the parking brake?

I have the secret code to disable the emergency brake fucntion. I can watch DVD's, iPod videos, TV, or an auxilliary input. I also have a rear seat monitor for the kids so they can watch anything they want.

But it's all wired nice and legal, just in case. [img]/ubbthreads/images/graemlins/wink.gif[/img]
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Old 12-22-2006, 02:11 AM   #8 (permalink)
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Re: Which wire is the parking brake?

Parking Brake = lt. green/red - parking brake switch
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Old 02-16-2011, 11:48 AM   #9 (permalink)
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Thanks SPL2K But where is that wire located at? I can't find it anywhere...I only found the two wires wrapped in the black wire loom stuff and neither of those two wires gave any power when the Parking Brake is on.?!? I cant find any other wires near my E-Brake? PLEASE HELP!!
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Old 02-16-2011, 05:54 PM   #10 (permalink)
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I don't have a schematic handy to check to see if this is how the parking brake circuit works, but many times actuation of various things in a vehicle actually completes a path to ground instead of applying +12VDC (most of the switches in steering wheels work this way - or at least used to). Instead of looking for 12VDC, you might try a continuity check to ground. When the parking brake is not set, you whould see an open circuit or infinite ohms. With it set, you would see about 0 ohms. I installed a DVD head unit in my truck and had the same thing - a wire to connect to the parking brake to prevent the DVD function from working (and maybe the ability to input information into the GPS) unless the parking brake is set. On my head unit (a Kenwood), this wire looks for a ground - not +12VDC. I simply grounded the wire to a nearby screw so I wouldn't have to mess with tapping into any wires (and also allow all functions to be available all the time). Check your head unit's documentation to see if this is the case with yours.
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Old 02-17-2011, 03:04 PM   #11 (permalink)
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I think you are going to be out of luck on that one - especially if you are looking for a ground (or +12VDC for that matter). There was a change in the way the parking brake switch works in 2003 (assuming 2003 since my truck is a 2003 and does not match the 2002 schematic that I have).

According to the 2002 model schematic, the parking brake switch is grounded on one side and has a light green w/ red tracer wire going to the switch. This wire would become grounded when the parking brake is set. The schematic shows the light green/red wire going to the instrument cluster, but nothing more than that. If you want to make things more complicated, the models with daytime running lamps have a parking brake relay that completely changes how things work.

Here's where it gets more difficult: I looked at my truck (a 2003 model) and here is what I found:
The parking brake switch is gray in color. Starting at the parking brake pedal, follow it up close to the pivot point and you'll see the switch. There is a wiring harness with white wrapping that connects to it - the connector on the end is black. The wiring harness has 2 wires - a green w/ red tracer and a solid pink wire. The green w/ red tracer wire always had +12VDC on it (when the key is on) and the pink wire did not have voltage. I measured the resistance of the switch and it fluctuated quite a bit, but was somewhere in the neighborhood of 100 ohms with the switch not depressed (the position it would be in if the parking brake was set) and it was an open circuit when pressed (the position it would be in when the parking brake is released) - I'm not sure why Ford would have had a resistor in the switch other than to limit the current flowing through the wire. I don't have a schematic for 2003 and up models, so I don't know where the power is coming from or going to - but one thing that is for sure is that neither wire connects directly to ground (verified by continuity checks).

The basic operation of the switch looks like +12VDC is supplied to the switch by the green/red wire. If the parking brake is released, the circuit is broken and there is no voltage on the pink wire. When the parking brake is set, the parking brake switch closes and puts a small resistance in the circuit, and power is applied to the pink wire. Without knowing where the pink wire goes, I can't make any assumptions about the rest of the circuit, but conceivably there would be a positive DC voltage on the pink wire, but less than 12VDC since the resistance of the switch will drop some of the voltage.

So to sum it up, if you need a chassis ground or +12VDC with the parking brake set, you won't get either with the way the circuit works. This info is all for a 2003 model, but later models are probably similar.
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Old 02-19-2011, 09:36 AM   #12 (permalink)
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Get a 12V SPDT (single pole, double throw) relay. rig it so the switched 12V out of the back of the radio that is used to power up an amp will trigger the relay to ground every time you power up the radio. Hook up the parking brake wire to the relay so when the 12 hits the relay the contact will be made to ground for the parking brake wire coming out of the back of your radio. That is exactly what the radio is looking for. That's what I did. No need for switches or find out what wire is the parking brake wire. You just need a good ground and you can find that anywhere.

You cannot just simply hook up the wire for the parking brake to ground and walk away. However, you could hook up a switch to ground but that kind of stinks having to switch it every time you want to use your phone, etc. Nothing like having it all automatic.

I got the relay for $1.49 from Allied Electronics and it's stock # 686-0312 . or you might be able to get one at a RadioShack or alarm supply dealer.

Granted it shows that he's hooking it up to a Pioneer but it will work on your radio too.

Good luck


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