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  #241  
Old 09-06-2013, 09:35 PM
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Re: The Towing thread

Quote:
Originally Posted by WarrenK View Post
Hi BobT,
The unit plugs into the OBDII port which an auto industry standard interface port, so doesn't matter what Jeep or what brand of vehicle with these ports it should work.
My understanding of the device is it monitors sensors in the vehicle such as inertia sensors, brake pressure, engine and transmission temp, speed etc. The system can apply modulated voltage(heavy or light braking) to the trailer brakes based on the information from the various vehicle senors.
The unit will start braking the trailer almost as soon as the tow vehicle starts braking. The end result is the trailer brakes are activated quicker than one stand alone proportional units.
It also monitors the trailer brakes and wiring and if a fault is detected warns the driver.
For smaller trailers it probably not worth it, but for the heavier ones could be an advantage.

Warren
Warren that sounds extremely innovative. OBDII is a standard however a vehicle does not necessarily report all possible events. If the Jeep does indeed communicate all the events you've listed, the controller is pretty much assured to be the new "best available".

Nice find.

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  #242  
Old 09-07-2013, 04:00 AM
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Re: The Towing thread

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Originally Posted by Willx View Post
Prodigy P3 instantly activates brake on brake switch so the ODB2 is not "faster" and frankly other than on a really rough road where the G Forces in the vehicle were changing radiacally I did not find a big difference with the OBD2 over the Prodigy P3 (which also diagnoses trailer wiring).

Tried a demo ODB2 unit and compared it to my Prodigy P3 and I did not find a big enough difference to warrant the price difference on a 3250KG Trailer that I tow ever other weekend 8 month out of the year.
Willx,
Agreed the prodigy does give an initial signal to the trailer brakes when the brake switch is operated, then inertia sensor and electronics take over.

It is good to hear from someone who tried both types. Like I said in my last post there are probably more benefits for larger trailers than small. From what have read about trailers in the US they class anything under 3,500kg as a small trailer.

Quote:
Originally Posted by Barboots View Post
Warren that sounds extremely innovative. OBDII is a standard however a vehicle does not necessarily report all possible events. If the Jeep does indeed communicate all the events you've listed, the controller is pretty much assured to be the new "best available".
Barboots
If you read on some of the US caravan/trailer forums their comments basically agree with your conclusion.
There is a pretty good discussion on the Airstream forum
DirecLink Brake controller... - Page 1 - Airstream Forums

Warren
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  #243  
Old 09-07-2013, 04:14 AM
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Re: The Towing thread

Quote:
Originally Posted by Barboots View Post
Warren that sounds extremely innovative. OBDII is a standard however a vehicle does not necessarily report all possible events. If the Jeep does indeed communicate all the events you've listed, the controller is pretty much assured to be the new "best available".

Nice find.

Cheers,
Steve
There is another issue with OBDII. I have an Actron OBDII scanner. I contacted Actron for a software update because my MY12 GC is not listed. I have to use the default setting. Their reply was that OBDII data is usually not publicly released by the vehicle manufacture until the vehicle is well out of warranty and then some. This is typically 5 years after first release. So how well this unit handles the WK2's OBDII data is anybody's guess.

Edit: After reading WarrenK's post, I note that the DirecLink system applies ABS action to the trailer. That would indeed be a great advantage. I guess they would have to put some kind of wheel speed sensor on the trailer wheels.
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  #244  
Old 09-07-2013, 07:31 AM
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Re: The Towing thread

Quote:
Originally Posted by allypally View Post
Pulled the rear of the car apart today to run the wires for the brake controller.

2nd image shows the wiring behind the rear passenger side panel. The circled plug is the one which you need to tap into for a trailer plug.

The 3rd image is a blowup of the 2nd, showing a better detail of that plug. Can someone confirm that the RED WIRE is the power to the brake light?

The 1st image shows what is behind the driver's side rear panel.

[ATTACH][ATTACH]Attachment 28628[/ATTACH][/ATTACH]
Yep, the red wire is the brake light wire. The Mopar tow bar harness conforms to the flat 7-pin colour coding standard, see the attachment. The colours are quite different on the car side of the 13-pin connector, see the other attachment. The blue wire is not the trigger wire but the actual power lead to the electric brakes. The triggering comes from the brake light wire (red on the tow bar side of the connector and white/tan on the other side of the connector) back to the brake controller. This triggers the controller to energise the electric brakes via the blue wire. You can splice the trigger wire from the controller, into the brake light wire anywhere along its length. I chose to take all but the earth from the brake controller back to the 13-pin connector area. See the photo. The earth I connected to the nearest body earth post in the console. Likewise, the 12v supply to the controller can be taken from any switched 12V lead. I chose to take it from the red lead on the car side of the 13-pin connector.
Attached Images
File Type: jpg _A270901.jpg (436.8 KB, 60 views)
Attached Files
File Type: pdf Trailer-Connector-Wiring-Diagrams.pdf (846.7 KB, 46 views)
File Type: pdf 13 pin plug wiring.pdf (99.6 KB, 32 views)
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  #245  
Old 09-07-2013, 08:49 AM
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Re: The Towing thread

Thanks Bob. I actually checked the brake wire feed with a multi meter, to confirm.
One thing I found when all the covers were off, was that the airtank for the suspension was loose. The crew on the bracket on one end was loose, while the other end was completely undone. I will post an image tomorrow.
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  #246  
Old 09-08-2013, 01:51 AM
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Re: The Towing thread

Quote:
Originally Posted by allypally View Post
Thanks Bob. I actually checked the brake wire feed with a multi meter, to confirm.
One thing I found when all the covers were off, was that the airtank for the suspension was loose. The crew on the bracket on one end was loose, while the other end was completely undone. I will post an image tomorrow.
Good move to use the multi meter. Diagrams are good but shouldn't be trusted. You will note that the trailer side of the 13-pin connector has metal tags but only for the 6 pins used. Had all the tags been there the wiring could have been tidier. I tried to source the tags but no luck. It's quite an exotic connector.
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  #247  
Old 09-08-2013, 04:17 AM
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Re: The Towing thread

As stated earlier, while having the rear panels off for wiring an Anderson Plug, I found the Quadralift airtank was lying loose at one end. The clamp appears as though it was never screwed down
The images show the screw, and the socket, clearly cm's apart.


DSC00832a.jpg

DSC00833a.jpg
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  #248  
Old 09-09-2013, 06:17 AM
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Re: The Towing thread

Anyone thought about where they would fit a UHF? I am thinking of getting a GME TX3345 with a AE4012k2 antenna. P3 planned for the cubby.

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  #249  
Old 09-09-2013, 04:41 PM
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Re: The Towing thread

Why not get a remote radio, and store it in the cubby under the passenger seat. The mic can reside in the cup holder. The antenna will be a somewhat harder fit, unless you mount on a Z bracket on the bonnet, or a bull bar.
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  #250  
Old 09-09-2013, 05:18 PM
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Re: The Towing thread

Thanks allypally good idea ill look into it. I was going to go with a z bracket.
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  #251  
Old 09-13-2013, 04:08 AM
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A glowing review for the 2014's towing ability.

http://www.caravancampingsales.com.a...?WT.seg_4=NEDM

Is this true though, I thought Jeep recommend using a WDH.

"However the Grand Cherokee Overland’s standard Quadra-Lift air suspension with its five height settings took it in its stride without any other load-levelling assistance – Jeep, like most manufacturers who fit air suspension specifically recommend against them – and the van sat level and rock solid all the way north."
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  #252  
Old 09-13-2013, 09:43 AM
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A glowing review for the 2014's towing ability.

http://www.caravancampingsales.com.a...?WT.seg_4=NEDM

Is this true though, I thought Jeep recommend using a WDH.

"However the Grand Cherokee Overland’s standard Quadra-Lift air suspension with its five height settings took it in its stride without any other load-levelling assistance – Jeep, like most manufacturers who fit air suspension specifically recommend against them – and the van sat level and rock solid all the way north."
The air suspension alone without WD is dangerous... Jeep says nothing of the sort. If you have 1000 pounds tongue load and no WD your vehicle may level but then your steering is completely compromised.

I can't believe a trailer place would even try that or recommend that! Clearly they don't understand physics.

Someone should write them Jeep North America restricts the tongue load to 500 pounds without WD.
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