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  #1681  
Old 05-23-2016, 12:53 AM
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Re: The Towing thread

Who's familiar with the towbar package that Jeep installs on its cars?

Jeep did mine as a part of the deal. Also wired in a 7 pin plug.

Today I had a look at it. The cable loom disappears into a cable gland (I dunno what else to call it) on the left side around the spare tyre well area.

All 7 wires are present and connected. Pin 5 for trailer brakes has a wire present as does Pin 2 (for reversing lights).

Neither P2 nor P5 have any power to them.

Who knows what this loom connects to at the other end (aside from the standard lights and earthing point)?


Thanks.

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  #1682  
Old 05-23-2016, 01:17 AM
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Re: The Towing thread

Quote:
Originally Posted by mjt57 View Post
Who's familiar with the towbar package that Jeep installs on its cars?

Jeep did mine as a part of the deal. Also wired in a 7 pin plug.

Today I had a look at it. The cable loom disappears into a cable gland (I dunno what else to call it) on the left side around the spare tyre well area.

All 7 wires are present and connected. Pin 5 for trailer brakes has a wire present as does Pin 2 (for reversing lights).

Neither P2 nor P5 have any power to them.

Who knows what this loom connects to at the other end (aside from the standard lights and earthing point)?

When I had the Tow Pro installed the autolec connected the controller's output wire (the one that sends power to the brakes) to P5 as per the standard and the brakes work fine.

To get my fridge in the van running on DC it requires a blue wire which is connected to P3 on the van side to be live. I did this by tapping into the Power Outlet in the cargo bay (it's the one that turns on and off with the ignition).

All that works. But as I couldn't find where the P2 wire went to I used my own. Might've saved a bit of work had Jeep made it a switching wire.
Martin
The wiring loom goes up into the LH rear pillar behind the torch. To see it you'll have to unclip the rear trim panel.
The harness fitted to our 2015 has plugs that fitted to the existing tail light loom inside the pillar - but our 2012 simply got tapped into the wiring. The factory makes no provision on the export models to connect trailer wiring or brake controller.
This harness, along with the Cat 4 tow bar is a locally (well NZ made product), so - you won't have a feed for the brake wire, nor the reversing light (the wires are there but not connected to anything).
You get stop, tail and indicators fed to the trailer socket - thats your lot.

To cater for the multitude of wiring configurations that people and auto electricians invent would be impossible.

If your leccy connected a brake wire from the controller all the way out to the tow bar plug (you say P5) why is it an issue?
John
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  #1683  
Old 05-23-2016, 01:19 AM
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Re: The Towing thread

Pin 5 should have power to it when the brakes are applied.
The higher you turn up your brake controller the more power.
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  #1684  
Old 05-23-2016, 02:30 AM
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Re: The Towing thread

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Originally Posted by tasjeep View Post
Pin 5 should have power to it when the brakes are applied.
Yep, sorry, you're right. I should've clarified this in my post. Not sure why I mentioned P5. It's connected to my Tow Pro Elite (which works quite well, I must say, for the 16km that I've used it from the test drive with the new van to home...)

Just wanted to know what the other end had connections to for P2 and P5. Nothing, obviously.

I've disconnected the wire to P2 for use with a switched wire from the cargo bay GPO. This activates a relay in the van to allow the fridge to run when the engine is running.


Dozen madder, as Con would say. It's all good. Fridge now working as it should on DC, AC or gas.
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  #1685  
Old 05-23-2016, 08:45 PM
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Re: The Towing thread

Quote:
Originally Posted by John47 View Post
From information readily available on the web - 6mm automotive cable is measured nominally by the OD - and in this case the cross sectional area equates to 4.59mm sq. mm is an industry term and doesn't relate to cross sectional area.
Taking this further - 6B&S provides nominally 13.56mm sq and 4 B&S provides nominally 20.26 mm sq.
So you can see there is a massive difference in conductor size.
As Trevor noted - if you have 6B&S to the Anderson it should be OK.
Worthwhile going back and reading Futuresystems posts as well…..
John
This link gives a depressing rundown of the Aussie auto wiring shemozzle Auto Cable by Collyn Rivers
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  #1686  
Old 05-23-2016, 10:38 PM
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Re: The Towing thread

Geez Bob!
No more fuel for this fire!
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  #1687  
Old 05-24-2016, 01:02 AM
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Re: The Towing thread

Here's another question and this one may be a tad curly. Rear suspension airbags - can they replace the need for a weight distribution hitch?

In my case the van has a rated towball weight of 226kg (tare of 2,230kg). I don't have Quadralift.

Thanks.
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Old 05-24-2016, 01:08 AM
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Re: The Towing thread

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Originally Posted by BobT View Post
It doesn't increase the voltage but the cabling to the rear of the car is so heavy that the voltage drop is very much less particularly with high currents. The cabling supplied is 4B&S battery cable in both +ve and -ve earth return. It is a good idea to have a heavy earth return back to the battery to avoid having such large currents running through the body. It can cause catalytic corrosion. John47 mentioned the availability of twin 6B&S cabling. If you are not buying the Projecta trailer kit, this is a good idea because I can tell you, feeding two 4B&S cabled thought the body, is bloody hard.

The isolator doesn't need to provide a fancy charging profile. My trailer has a lithium battery management system so all the isolator needs to do is supply a decent voltage at whatever current the battery management system wants and it looks after the rest.

The battery management system has a readout in terms of percentage charge. I easily get 100% charge or at least that's what it tells me.

Dead right, it's a 220A alternator. I figured I should put in a system that could take advantage of such a large alternator regardless of what I was towing.
Fair enough, but if you have a lithium battery management system which is managing the charging of the Lithium batteries then it is bumping up the charge voltage and measuring current going in, otherwise it has no idea what 100% is.

If someone had the same in front of an AGM they wouldn't need a DC charger either.
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  #1689  
Old 05-24-2016, 01:36 AM
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Re: The Towing thread

Quote:
Originally Posted by mjt57 View Post
Here's another question and this one may be a tad curly. Rear suspension airbags - can they replace the need for a weight distribution hitch?

In my case the van has a rated towball weight of 226kg (tare of 2,230kg). I don't have Quadralift.

Thanks.
Not a curly one at all, in fact an easy one. Answer is no.
Air bags will help the rear from sagging but will leave all the extra weight on the rear axle.
A WDH not only helps level but it also transfers some of the weight onto the front axle, reducing rear tyre wear and maintaining the cars braking performance.
I have Quadralift and still use a WDH.

Trevor
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  #1690  
Old 05-24-2016, 03:35 AM
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Re: The Towing thread

Quote:
Originally Posted by mjt57 View Post
Here's another question and this one may be a tad curly. Rear suspension airbags - can they replace the need for a weight distribution hitch?

In my case the van has a rated towball weight of 226kg (tare of 2,230kg). I don't have Quadralift.

Thanks.
As Trevor says - not curly - No.
His explanation is spot on.
I also have QL and use a WDH.
As I recall vehicles sold in AU are fitted with self leveling shock absorbers on the rear as standard - at least they used to be.

Suggest you might go back to the Caravaners forum and search your question for endless hours of reading.

To take this a bit further, CJA (Jeep) recommend use of a WDH when towing an ATM above 2268kg. It's in your handbook.
You might touch base with your insurer regarding their attitude if there is an incident while you are towing if you decide not to use one, and your van comes in above their threshold.
John
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  #1691  
Old 05-24-2016, 03:50 AM
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Re: The Towing thread

I think that the manual says to use a WDH if the ball weight is above a certain figure, something like 230kg. I'll have to read it again.

It was suggested to me today that these airbags can alleviate the use of the WDH. I politely said that I'd "look into it".

Whatever, I asked here just to make sure. I suppose that the Caravan forum does have a lot of info there but I was aiming at a Jeep specific forum such as this.
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  #1692  
Old 05-24-2016, 04:00 AM
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Re: The Towing thread

Air bags cant transfer the weight to another axle can they?
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