Towing Connector Voltage - Ford F150 Forum - Community of Ford Truck Fans

Go Back   Ford F150 Forum - Community of Ford Truck Fans > Ford F150 Forums > Towing/ Hauling/ Plowing
Log In 

Towing Connector Voltage

Thread Tools Search this Thread
Old 08-22-2012, 11:05 AM   #1
Junior Member
Join Date: Aug 2012
Location: Prescott, AZ
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Default Towing Connector Voltage

I have a 2012 F150 with the tow package. I have installed the relay and 20A fuse (although the schematic shows a 30A fuse) in order to get 12 V on the 7 pin trailer connector. With the engine running, I measure 14 V at the connector - the same as at the battery. The data sheet that came with the relay and fuse says that line will supply 11.5 A (which seems low to me). My trailer has a small refrigerator that draws roughly 11 A from the 12 V line. When the fridge is on, the voltage at the battery is still about 14 V, but the voltage at the 7 pin connector is a bit lower than 13 V, which is not enough to keep the trailer batteries charged and run the fridge. The 1 V drop from the battery to the connector seems excessive to me. I have towed this trailer with 2 other (non-Ford) vehicles with no charging problems. Does anyone have any thoughts on what the problem might be or how to fix it? Thanks for the help.
BudS is offline   Reply With Quote
Join F150 Forum

Join Today - It's Totally Free!

Are you a Ford F150 fan? If so we invite you to join our community and see what it has to offer. Our site is specifically designed for you and it's a great place for Ford F150 Fans to meet online.
Once you join you'll be able to post messages, upload pictures of your truck, and have a great time with other Ford F150 fans. Whether your an old timer or just bought your F150 you'll find that is a great community to join. Best of all it's totally free!

Join Today! - Click Here JOIN FOR FREE

Old 08-22-2012, 08:21 PM   #2
Senior Member
5 Year Member
Join Date: Apr 2011
Posts: 890
Thanked 61 Times in 51 Posts

The worst part, is that the voltage sags way lower while travelling, and you will not even be getting 13v when going down the road. I agree this is and issue, and I have no idea what the solution is. Newer vehicles with their high tech charge management seem to exibit trailer power issues. Another example is that once towing, 14 volts is rarely seen, and only when coasting, and only with the cruise control off. You can monitor it through the engineering test mode.
2013 F150 XLT SCAB 4x4 w/3.73's, Rousch CAI, Resonator Bypass
Traded my excellent 2011 F150 - Vehicle #10, and the best I have owned.
2011 F150 SCAB 4X4 3.7 w/3.73's
Rousch CAI
isthatahemi is offline   Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
DIY TSB: Overly Aggressive Driver Seat Lumbar In Relaxed Position ChicagoJim 2015 - Present Ford F150 57 Yesterday 09:32 PM
How To: 2015 F-150 Front Bumper/Tow Hook Removal boozinbuzz 2015 - Present Ford F150 7 06-02-2016 01:25 AM
Fuel Pump Connector Replacement countryhick 1987 - 1996 F150 6 09-14-2015 09:57 PM
Electrical trailer tow installation instructions. thsmith 2015 - Present Ford F150 5 09-14-2015 12:41 AM
95 2WD inner/outer tie rods tips and tricks? ericantonio Suspension & Brakes 3 09-10-2015 11:29 AM

7 pin connector, towing, voltage

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -4. The time now is 05:58 PM.

Copyright 2006 - 20011
This site is in no way affiliated with the Ford Motor Company.