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Old 05-28-2019, 09:11 PM   #1
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Lightbulb Problem hooking up 4 flat to 7 blade wiring kit

Good evening all!
Sorry in advance if this is drawn out, but I'm not sure what I'm doing, so I'll ask.
DH and I are trying to hook up the towing lights for our new to us 2003 X-Treme Lite hybrid TT. It has the 7 blade connection. We have 2 tow vehicles: 2001 Dodge Ram conversion van and a 1991 Ford F150 pick up. Both have the 4 flat connection. We didn't have the correct connector when we purchased the camper from a private seller, so we chanced it coming home (me driving our car right behind him the whole way, lol).
I've purchased the correct connection, a Hopkins connector, # 47205. I thought all I had to do was plug them together and ground and it should work. But it didn't. So, what am I doing wrong? And, how do I test if the problem is on the TT side?
I've tried looking up some troubleshooting, but all I get are usually about motor homes and tow vehicles.
I yield to the experts and thank them in advance for your help.
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Old 05-28-2019, 09:21 PM   #2
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If your trailer has electric trailer brake and a battery that needs charging , those are the extra hook ups in a seven way ; your trucks are wired for boat ( utility) trailers that don't have either. ( four way is lights only and ground)

You need to add wiring to the truck , for a charge circuit and an electric trailer brake controller.

www.etrailer.com/faq-wiring.aspx
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Old 05-28-2019, 10:08 PM   #3
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I recommend taking your vehicle to a trailer hitch shop or an auto electric shop and let them install the connector and brake controller.
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Old 05-28-2019, 10:53 PM   #4
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Your 91 F150 may already have a 7 pin lurking somewhere by the spare tire
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Old 05-31-2019, 08:30 PM   #5
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Thank you

Thanks all! I'm headed to U-haul Saturday to deal with it.
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Old 06-01-2019, 04:29 PM   #6
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A lot of newer vehicles already have the harness installed from the factory, Hopkins and other manufactures make a pre-wired harness that just plugs in between the factory wiring harness, and has the seven blade plug. The second thing, which is much harder, is finding the prewiring under the dash for the brake controller. Some of these have plugs, others just have loose wires. On my 2017 Tacoma, Toyota hid these wires behind the fuse box. Unless you know exactly where to look, you will not find them. It's to make you go back to the dealer to have it installed! LOL!
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