Electrical towing problem - Ford Transit USA Forum
 
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post #1 of 4 (permalink) Old 01-02-2017, 05:19:PM Thread Starter
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Electrical towing problem

Have a 2016 transit cargo 350. The dealer had an after market brake controller added to van, a tekonsha primus. We sometimes use the van to tow our airstream and also a utility vehicle.
Soon after the installation the trailer brakes and lights would not work on our utility trailer when towed with the van. They would work when we towed it with our truck. The trailer brakes and lights on our airstream worked fine when towed with the van.

This last week we towed our airstream to Palm Springs from Oregon with our van. Along the way we noticed our battery in the trailer getting drained as we drove instead of getting charged as it normally does. Also, as we drove at night we noticed that the trailers running lights would go off whenever we tapped the brakes or used the turn signal. Thankfully we never lost brake controll.
We have checked the fuses and the J Fuses and today I got an oil change at the dealer and had them check the fuses. All are fine.
I took the van to a hitch installer today and he would not work on the van because he says they have problems with towing due to wiring configurations related to a module under the hood. Does this make any sense?
At first we thought we might have a faulty brake contoller or something to do with that. thoughts?

Last edited by MatthewPG; 01-02-2017 at 05:47:PM.
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post #2 of 4 (permalink) Old 01-02-2017, 05:27:PM
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Read through this thread. There is mention of your problem here: Installing Tow/Trailer Hitch Wiring Harness

Own: 2015 T-350 long and tall cargo van, 3.5L EB, 3.31 rears, Espar B-4 heater, 245/75 R16 Michelin LTX M/S. Used in nation wide expedited freight delivery.
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post #3 of 4 (permalink) Old 01-02-2017, 05:54:PM Thread Starter
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I think it has all the parts as Ford ordered parts for the installer to use.
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post #4 of 4 (permalink) Old 01-04-2017, 08:22:PM Thread Starter
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OK Follow up
Looks like my sequence module is bad. Also the installer wired both the sequence module and the trailer brake controller to the battery on the same wire with one 10 amp fuse. This one 10 amp fuse was linked to two 20 amp relays. So the fuse blows out quickly. Hopefully will be fixed tomorrow.
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