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  1. #1

    My Tow Pro and Anderson Plug Install

    I sold my Prado to my parents, but did a couple of extra modifications before handing it over. This thread is my last contribution to this forum, so I also wanted to say "thanks!" - it's been a great community to be a part of and an excellent resource for the Prado! Two thumbs up!

    SUMMARY
    The car already has a compressor and dual battery system (as per this thread). My parents tow a camper around, so they needed an Anderson plug at the tow bar and an electric trailer braking system. They also use the large 7-pin round trailer plug, plus it made more sense to have the compressor outlet at the rear of the car so that it can reach the camper tyres. I should note that it probably took longer because I was modifying an existing system, rather than doing it all from scratch.

    Components
    Redarc Tow Pro Elite Kit
    50Amp Anderson Plug
    50Amp MAnual Reset Circuit Breaker
    6B&S (~13.5mm˛) Twin Cable
    8B&S (~8mm˛) Twin Cable
    13B&S (~2.9mm˛) Twin Cable
    Cable Lugs
    10mm Air Hose
    18mm Rubber-lined Hose Saddles
    Air-On-Board Compressor Dash Switch
    Aluminium Angle Section
    16 Beers


    Anderson Plug
    The cable runs from the auxiliary battery to the passenger side of the fire-wall, then along the door sills to the compartment where the jack is stored. I pulled apart a small section around the third row seats and found a fairly accesssible grommet to get the cable out to the tow bar. I had to do a bit of tricky manipulation of the cable to make it sit nicely in the door sill channels to get it to work, but got there in the end. Getting the cable to the third row was easy. Once you have the second row sill out, the door seal is freely removed. I peeled a bit of that back and was very easily able to push a tongue through to the third row cup holder. At the battery end, I had to doctor up a bracket for the extra switch. If I had my time again, I probably would have made up a bus bar to make it all a bit neater. This time, rather than hiring the hex crimpers, I bought them. Cost me $150 (Utilux #22 Crimps).

    Tow Pro Elite
    Like many others, I mounted the Tow Pro under the dash, but I didn't trust the double-sided tape to last forever, so I wedged a block of form-ply in the gap (perfect fit) and screwed it in. I powered the Tow Pro from the main battery, via an auto-reset circuit breaker. 8B&S twin cable. Probably overkill. I ran the 13B&S cable to the jack compartment and terminated to the 12V trailer brake wire (loose blue wire) and to the car's brake light wire (red wire with black trace). The reason I chose to take the signal from the brake light rather than from the purple brake pedal wire is because I don't think stability/traction control brake signals would be applied through the purple wire. I can't imagine insurance companies being too cooperative if they found that a trailer brake system circumvented safety braking systems. Also, I stumbled across this article, which states to use a diode to prevent back-feeding power into the vehicle from the trailer braking system. This is something I think should be installed if wire in at the pedal too. I only ever use 1N4007 diodes. I haven't found a practical use for smaller diodes when this one will do the trick too... Putting the dial in the centre console seemed like a no-brainer to me. I'd want to see what the trailer brake is doing while I'm driving, plus I think it needs to be easily reachable without fumbling blindly.


    I had to make up a new bracket to mount the 50A breaker for the Anderson plug.
    002.jpg

    I've put the Tow Pro's 30A auto-reset breaker after the isolator breaker so that if the isolator is tripped, it'll disable ALL aftermarket electrics. It's highly unlikely to trip on it's own.
    003.jpg

    The Tow Pro mounted behind the glove box
    000.jpg

    The Tow Pro dial - actually dead straight but the pic doesn't do that justice
    001.jpg
    Last edited by AK7; 18-04-2017 at 05:56 PM.

  2. #2
    Compressor
    The idea was to get hands away from the compressor because it gets so damned hot. From recollection, I had the 10mm hose made up at 6750mm. Just long enough to reach the tow bar with a bit of a loop to install into a tank later on. Got it professionally crimped and then found 18mm rubber-lined hose clamps to mount it to the chassis. I really didn't want the hose in the chassis because a lot of the edges of the holes in the chassis are sharp enough to sever a hose over time, plus I found the chassis collects dirt whenever the car goes off-road. The hose would trap dirt in there. The threaded bolt holes were well placed along the rail. When I reached the rear of the car, I ran the hose over the top plate for the rear springs to get to the other side of the chassis rail so it could mount neatly onto the tow bar. It makes the compressor much harder to uninstall now, but that's not something that needs doing often Moving the hose out from under the bonnet also meant moving the switch to the dash. I've advised my folks to leave the circuit breaker off under the bonnet so that they get into the routine of putting the bonnet up while using the compressor.


    Tow Bar
    The final stage was making up an angle bracket to house the large round trailer plug, the Anderson plug and the air hose and then making that fit the tab on the tow bar that was originally for the flat trailer plug.


    The threads in the chassis made it easy to mount the hose securely and safely while avoiding the brake lines.
    005.jpg

    Air On Board switches are the duck's nuts! Yes the compressor switch lights up too.
    007.jpg

    All of the attachments at the tow bar. Next time I visit my folks, I'll mount the 7-pin flat connector above the round connector. Options
    004.jpg

    The finished product at the posterior end...
    009.jpg
    Last edited by AK7; 18-04-2017 at 05:52 PM.

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