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7 pin to 4 pin harness/adapter

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Old 06-26-2011, 03:57 PM   #1
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7 pin to 4 pin harness/adapter

I am the proud owner of a brand new (to me anyway) 2008 Tacoma 4x4 OR w/tow package as of yesterday and I couldn't be happier. Since the truck was used it didn't come with the 7pin to 4pin wiring harness that comes with new trucks (or at least I haven't found it). I know there is also a 7pin to 4pin adapter. So here's my probably stupid question so go easy...what the hell is the difference between the harness and adapter and do I need both? Thanks alot.
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Old 06-26-2011, 04:09 PM   #2
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No you don't need both since your truck already comes with a 7 pin plug and wiring harness. The 7 - 4 pin adapter just allows you to connect the two.
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Old 06-26-2011, 04:38 PM   #3
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NAPA

You should be able to go to your local NAPA store and get the 7 pin to 4 pin adapter plug
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Old 06-26-2011, 04:49 PM   #4
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Originally Posted by Teniente View Post
You should be able to go to your local NAPA store and get the 7 pin to 4 pin adapter plug
This^^^
10-15 bucks at any auto parts store.
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Old 06-26-2011, 05:23 PM   #5
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Thanks for the help. Quick question though, what is the 7-4 pin wiring harness and what's it use for?
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Old 06-26-2011, 05:36 PM   #6
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The 7 pin "RV" plug includes brake lights, running lights, turn signals, powered brakes and back up lights. The 4 pin harness just has brake lights, turn lights, and running lights.

If i was you i would just cut the 4 pin off and wire up a 7 pin adapter to your trailer so you don't have to worry about an adapter between the two
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Old 06-26-2011, 09:41 PM   #7
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Quote:
Thanks for the help. Quick question though, what is the 7-4 pin wiring harness and what's it use for?
It's not a harness. It's an adapter plug. It has 7 female pin holes on one end and 4 on the other.
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Old 06-27-2011, 07:05 AM   #8
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If you do go the adapter route, get the one with LED indicator lights on it. It'll easily identify if you have a trailer or truck wiring/light issue.
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Old 06-27-2011, 07:09 AM   #9
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Quote:
Originally Posted by dexterdog View Post
It's not a harness. It's an adapter plug. It has 7 female pin holes on one end and 3 female/1male on the other.
Fixed for ya.
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Old 06-27-2011, 08:54 AM   #10
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Quote:
Originally Posted by skytower View Post
If you do go the adapter route, get the one with LED indicator lights on it. It'll easily identify if you have a trailer or truck wiring/light issue.
Good advice here...

although everyone of my issues has always been on the trailer end.
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Old 06-27-2011, 12:10 PM   #11
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Quote:
Fixed for ya.
Hey thanks.
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Old 06-27-2011, 12:15 PM   #12
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Question has been kind of answered so a mini-hijack might be ok but...

I also have a 08 tacoma i bought used and it has tow package. I see the guy installed a electronic brake controller screwed to my drivers side console thing.

If the factory 7 pin includes a electric brake pin, does Toyota just not include a controller from the factory ? Or how does that all work ?

Thanks!
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Old 06-27-2011, 04:54 PM   #13
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Quote:
I also have a 08 tacoma i bought used and it has tow package. I see the guy installed a electronic brake controller screwed to my drivers side console thing.

If the factory 7 pin includes a electric brake pin, does Toyota just not include a controller from the factory ? Or how does that all work ?

Thanks!
No, you have to buy the controller but there is a plug under the dash.
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Old 06-27-2011, 06:19 PM   #14
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i just bought a new 11 with tow package is it supposed to come with the adapter to 4 pin
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Old 12-29-2011, 09:47 PM   #15
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I just bought this one....
http://www.amazon.com/Hopkins-47345-...5214777&sr=8-2
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Old 12-30-2011, 06:07 AM   #16
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Quote:
Originally Posted by fastboy559 View Post
i just bought a new 11 with tow package is it supposed to come with the adapter to 4 pin
Mine did not and my buddies did not. Both 2011 DC Off Road TRD's

Cam
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Old 12-30-2011, 08:21 PM   #18
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Walmart has them cheap.
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