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Trailer electrical connections

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Glenn(WV)

08-12-2002 05:20:50

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I was at Wal-Mart Saturday night looking at their trailer accessories. I noticed the selection of electrical connection adapters they had, and I got to wondering:

Let's say you have a four-pin electrical connector on your truck and a seven-pin connector on your trailer. Will a four-to-seven-pin adapter provide power to the trailer brakes, or are they bypassed? I realize that it's not the same as having a brake controller in the cab of the truck, but I was wondering if the adapter provided power to the brakes.

If not, is there a way to still use the four-pin connector on the truck and add a brake controller?

Thanks, guys.

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paul

08-12-2002 13:51:17

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Re: trailer electrical connections in reply to Glenn(WV), 08-12-2002 05:20:50

In my state it is illegal to have an adaptor as you describe - 7 pin on trailer, 4 pin on truck. The 4 pin does not support brakes. Going the other way (7 pin truck to 4 pin trailer) to pull a light trailer without brakes is a simple adaptor.

As the others say, best to standardize. You could do seperate wiring, but just hard to troubleshoot or rework with other trailers/trucks in the future.

--->Paul

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Bob - ECen KS

08-12-2002 08:29:54

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Re: trailer electrical connections in reply to Glenn(WV), 08-12-2002 05:20:50

I just went through this with a vehicle I purchased - the route I went - I found a dual plug for the vehicle (at wal-mart) that had both a 4 pin outlet and a 7 pin outlet. When you put it on the vehicle, the old 4 pin plug plugs into the 7 pin unit and there are pigtails for trailer brake and aux power on the plug for the vehicle. The 4 pin side gives you ground, left and right turn (and therefore brake lights) and tail lights. For brakes, you have to add a controller and wire it to the 7 pin plug. And you have to also pull a wire back for the aux power if you want that. This way I can hook to a small trailer without brakes, or my bigger trailers with brakes (I have a controller) and don't have to try to remember where I put the adapter. As mentioned in a previous post - get the standard wireing diagram from the net since the one provided with the kit may or may not be correct.

Bob

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Kevin Conover

03-08-2005 20:49:52

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Re: Re: trailer electrical connections in reply to Bob - ECen KS, 08-12-2002 08:29:54

where can I find a standard wireing diagram for brake controllers. Is there one standard by the SAE & ATA. I have a list from a trailer plug and on the plug it has the abbreveations of each funtion by the post. The problem is that a friend has a diagram for a brake controller that puts the Auxilary wire for chargeing the battery and such in a differnt post. It has it in the stop lite/antiwheel lock device post. Mine has it in the middle and his has the brake controller in in the middle. This is a 6 pole. Now they way he is doing it it will not work on my Holiday Rambler trailer and is different from my stock hook up on my 04 GMC and the 95 I had. His way put direct power to the trlr. brakes and locks them up. Kevin

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Ralph 560 in SWMO

08-12-2002 08:05:20

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Re: trailer electrical connections in reply to Glenn(WV), 08-12-2002 05:20:50

I have a 7even pin connector and braked controls on three of my trucks and the anser is, yes you can still have 4 pin. The 7 to 4 pin adapter will provide park, stop and turn lights without sending brake power to you trailer, but you can not go from 4 to 7 pin and get brake power.

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yes, but......Truck

08-12-2002 08:02:53

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Re: trailer electrical connections in reply to Glenn(WV), 08-12-2002 05:20:50

Actually the best route is to go all the way and install a real 7 way connector. And if you get it from Walmart....IGNORE THE WIRING DIRECTIONS you get with Hoppy products connectors. These folks must be dyslexic or maybe they are just plain mean. A trailer hooked up with their 7 way plug wired to a truck with one of their plug in kits won't work correctly at all.Been there, done that,ready to kill more than once. Go to the web and find on a Google search the correct wiring for your plugs and follow that. Look for the one that lists wire colors and functions. Funny thing, the color codes marked on the Hoppy stuff are in the correct locations... But when they show you a picture (which tells you to "ignore color codes as they are all different"it is way wrong.

All the 7 to four adapter does is enable you to use tail turn and stop lights. No brakes would work, and if you were to put in a connector for your brakes( another two wires to a controller, or more if you want to charge the battery,) your tow vehicle is the only one the trailer will work with. Try to standardize to fit most of your buddy's trucks you will tow it with and you'll be happier when it comes back with intact wiring. On my most often borrowed trailer I wired both the seven way and the four way flat connectors to stop the "improvements" folks were adding. Good luck!
Truck

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