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Sege 02-04-2013 05:07 AM

Tow Wiring
 
Not being a vanner we are going to hire a Jayco pop up and there was some mention of having a "hot" wire in the trailer plug to charge the van battery/fridge. Any one with any ideas, could there be a canbus problem? How else do the van batteries get charge - on a casual set up?

allypally 02-04-2013 05:27 AM

Re: Tow Wiring
 
Why don't you run a feed off the battery to the rear of the car. What sort of plug does the van have? Does it also have an Anderson plug?

John47 02-04-2013 05:29 AM

Re: Tow Wiring
 
GDay Sege,
There isn't a "hot wire" into the trailer socket as part of the towbar package (and on a standard 7 pin socket there isn't provision anyway).
A 12 pin socket does provide this facility.
I would suggest to be very careful with simply running an unprotected hot wire from the Jeep battery (no there won't be any canbus issues) to the trailer socket without some means of switching it off when the engine isn't running.
A typical 3 way fridge as used in most run of the mill caravans will flatten a battery in very short order (the heating element in the absorption fridge consumes 12 amps or more). Wire sizes must be suitable for this sort of current and minimise voltage drop.

What vanners do is to install a battery isolation switch - as simple as an ignition switched relay, or a proprietary motion switch, or a specialised battery isolator.

Charging the van battery is another issue and will require heavier cable to the van and more protection to your tug. Anderson plug and sockets are generally used here - a separate ballgame.
You would need to check the Jayco to see what you would need to match. Perhaps ask your hirer for specific requirements (they'll give you recommendations) and mosey over to Caravaners Forum • View forum - TECHNICAL Forum - Caravans, Motorhomes, Vehicles and Towing. and have a prowl around. What you are looking to do isn't a major issue but will take a bit of preparation of your vehicle.

I'm not aware of any safe way to do a "casual" setup - likely a scenario for something to go wrong and spoil a perfectly good holiday - done right means peace of mind.
Enjoy the vanning - the Jeep is a brilliant tow vehicle.

allypally 02-04-2013 05:31 AM

Re: Tow Wiring
 
If the van has a common flat 7 pin plug, it will have no hotwires running to the van. They will just be catering for lights (brake, parking etc). If the van is over 2tonne, you will also need a brake controller. Does the van hirer have one? If so, it will most probably be one that plugs into the cig lighter socket, so that shouldn't be a problem for you.

Sege 02-04-2013 05:38 AM

Re: Tow Wiring
 
Thanks chaps will need to interrogate the hireor in more detail I suspect.

BobT 02-07-2013 08:54 PM

Re: Tow Wiring
 
Given that the Jeep has an 220A alternator, I went for a Projecta 150A dual battery trailer kit. I wondered why the kit was so heavy and found that it comes with 3kg of copper wire.

allypally 02-07-2013 09:01 PM

Re: Tow Wiring
 
Does the Projecta cater for the new modern alternator configeration? I heard that some chargers would not be compatible with these new alternator outputs. Going to the Newcastle Caravan show tomorrow to check them out.

BobT 02-08-2013 01:24 AM

Re: Tow Wiring
 
Quote:

Originally Posted by allypally (Post 756091)
Does the Projecta cater for the new modern alternator configeration? I heard that some chargers would not be compatible with these new alternator outputs. Going to the Newcastle Caravan show tomorrow to check them out.

Don't know yet. I just connected it to the +ve terminal of the battery. It hasn't fired a shot in anger yet but the meter reading is correct and the right lights are on.


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