Can I use a 4 to 7 pin wiring harness adapter if I have surge brakes? - Toyota FJ Cruiser Forum
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#1 (permalink) Old 04-19-2010, 06:44 PM
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Can I use a 4 to 7 pin wiring harness adapter if I have surge brakes?

I will be picking up my 2010 black fj on wednesday and they are installing the trailer hitch and wiring tomorrow. My question is this. I have a 22 foot mastercraft boat and tandem axle trailer with hydraulic surge brakes. It has a full 7 pin plug on it and we have a honda ridgeline to tow it now. We don't have a brake controller though because we dont need it. The boat dealer told me that the 7 pin harness is used for leaving the disc brakes open when in reverse. Since this is the only use for the 7-pin harness, and there is nothing electrical about the setup, can i just use an adapter to plug the 7 pin harness into the OEM 4 pin outlet on the FJ or will a full 7 pin harness need to be installed? The toyota dealer said that they can't install the 7 on the FJ. This is my first post and any help or input on this is greatly appreciated.

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#2 (permalink) Old 04-19-2010, 06:54 PM
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Re: Can I use a 4 to 7 pin wiring harness adapter if I have surge brakes?

Yes , it will work . If the trailer does have disc brakes , You will have to use a pin or screwdriver in the appropriate hole in the surge brake unit so you can backup .
I followed these instructions to install a 7 pin plug in my bumper . Not too difficult to do . Only extra wire I ran was from the backup light circuit to the 7 pin plug .
http://www.fjcruiserforums.com/forum...harness-2.html
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#3 (permalink) Old 04-19-2010, 07:12 PM
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Re: Can I use a 4 to 7 pin wiring harness adapter if I have surge brakes?

So the adapter won't allow the brakes to open in reverse? I'm guessing the full 7 pin would make that happen?
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#4 (permalink) Old 04-19-2010, 07:16 PM
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Re: Can I use a 4 to 7 pin wiring harness adapter if I have surge brakes?

No . The 4 pin only has turn signal , brake lights , running lights and ground . The solenoid on the surge brake adapter is run off the backup lights .
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#5 (permalink) Old 04-19-2010, 07:23 PM
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Re: Can I use a 4 to 7 pin wiring harness adapter if I have surge brakes?

so can a 7 pin be mounted on the stock bracket underneath where the 4 pin is? so i can have a 4 and 7 side by side?
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#6 (permalink) Old 04-19-2010, 07:32 PM
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Re: Can I use a 4 to 7 pin wiring harness adapter if I have surge brakes?

Hopkins Towing Solutions has an adapter model # 47205 that you can hang under the bumper ( if you don't need the extra departure angle ) . The 4 pin connector plugs right into it , so the only extra wire you need to run is from the backup light circuit . I tapped into that wire on the drivers side jack compartment .
4-Wire Flat to 7 RV Blade (plastic) Adapter :: Hopkins Towing Solutions
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#7 (permalink) Old 04-20-2010, 08:52 AM
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Re: Can I use a 4 to 7 pin wiring harness adapter if I have surge brakes?

Quote:
redboat previously said: View Post
Hopkins Towing Solutions has an adapter model # 47205 that you can hang under the bumper ( if you don't need the extra departure angle ) . The 4 pin connector plugs right into it , so the only extra wire you need to run is from the backup light circuit . I tapped into that wire on the drivers side jack compartment .
4-Wire Flat to 7 RV Blade (plastic) Adapter :: Hopkins Towing Solutions
Redboat
The Hopkins plug is the way to go!I have the one that also has the 4 pin flat next to 7 pin plug.It is a real simple plug and play install and solves any towing hook up install.
I used this one for my install Multi-Tow® 7:4 Adapter :: Hopkins Towing Solutions

I dont wheel so departure angle is not an issue but with plug can hook up to any trailer set up.I tow a 19' bass boat with a 7 pin coil cord.

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#8 (permalink) Old 04-23-2010, 03:56 PM
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Re: Can I use a 4 to 7 pin wiring harness adapter if I have surge brakes?

thanks for the help! i am going to look into those options over the next few weeks. I just picked my FJ up 2 days ago and love it so far. I got the towing package installed at the dealer and i am very happy with it as far as looks. Very clean. So it has the 4 pin now and i will go with one of the options you guys suggested. One last question though. I do not know what i am doing as far as wiring, so i dont know if i want to try and tap into the backup light circuit. is there anywhere that you can just "plug and play" for this isntall under the dash or under the rear bumper where the 4-pin already is, or will there need to be slicing into existing wires?
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#9 (permalink) Old 04-23-2010, 07:23 PM
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Re: Can I use a 4 to 7 pin wiring harness adapter if I have surge brakes?

The easist place to splice is in the plastic panel on the drivers side that you access the backup light bulb for replacement . Just get one of these
Quick Splices 18-14 Gauge Blue by Dorman - Part 85464 - Advance Auto Parts
from an auto parts store and find the wire that goes to the backup light and snap it together with the new wire from the 7 pin socket . Mine is spliced into a red wire with a yellow stripe .
Good luck . PM me with any questions .
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Scuba Install QuickAir CO2 Tank
Demello 3 Hoop Bumper , Titan 10,000 LB Winch , Arco Lights with FJC Aux Light Switch
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#10 (permalink) Old 04-24-2010, 09:18 AM
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Re: Can I use a 4 to 7 pin wiring harness adapter if I have surge brakes?

The one i used (47185) is basically plug and play.Just plug the adaptors 4 pin flat plug and plug it into the existing dealer installed 4 pin flat plug .Then run a fused lead for the aux power lead to the battery and run the lead for the back up circuit up through the area where the jack is located (there is a rubber grommet right there) and splice it into the backup light lead accessing in through the removable plastic cover on the inside by the rear door.

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