How easy is it to add a 4-wire plug to the factory towing harness?

I have an '09 TRD with the OEM tow package. I would like to add a flat 4-wire plug to the harness so that I can use a receiver mounted brake lamp. There are aftermarket systems available that require some type of in-line module but can I just identify the proper wires and splice into them to power the flat 4-plug?

Thanks,

Ray

 

gotta redo this , too big of a link..... they make adapters, sells anywhere like home depot , auto shops or boating shops.

 

I have an adapter.....but there are times that I need to hook up to both the 7-pin and would like to have a flat 4-wire also.

Ray

 

http://www.homehardware.ca/en/rec/i...rcuit-Tester/_/N-ntjk8/No-48/R-I8730023?Num=0



like that? Hell I never seen or used anything like it, just 6.7. 4flat.

 

I think that I may have found what I've been looking for!

http://www.hopkinstowingsolutions.c...rnesses/toyota_tundra_with_tow_pkg_08-10.html

Ray

 

Old thread, I know... But I'm in the same boat and saw this same harness earlier. Did you ever buy it? Did it work?

I've left 2 of those 7 round to 4 flat adapters on the bumper... Looking for something more permanent for my boat trailers with the 4 flat plugs.

 

Did the OP ever figure out what works? The Hopkins 7/4 that was linked is supposedly only for the Tundra?

I'm trying to get the same result as OP - an independent 4 pin connection somewhere off the rear bumper that can power a hitch mounted brake light. I'm tired of tailgaters and late brakers and want something to get their attention.