2017 SD No 12v charge
Logistics Pro
Joined: Apr 2000
Posts: 4,334
Likes: 306
From: Mills River
Thanks,
Jim / crewzer
Junior User
Joined: Aug 2015
Posts: 87
Likes: 2
From: West Canada eh
I'm still trying to sort this out...
I've got no 12v from the truck to the trailer. Brake applied, TBC slider applied, truck in neutral or drive makes no difference, there has been no successful way to 'engage' the TRM module to send the 12v signal. I've tried tricking the module by hooking up a booster pack to the batteries on the trailer, then shutting off the booster pack so the truck would see a voltage drop/draw and enable the 12v, no luck. I've traced the wires, found the wires from the trailer plug to the trailer dist. box, to the batteries, everything shares voltages the same when i move the booster around and move the multimeter around, so the wiring all seems to be correct but I cannot get the truck to spit out 12v to charge!!
Any more ideas before cutting up the factory harness to run an upfitter switch with dedicated power from the battery?
Thanks everyone!
I've got no 12v from the truck to the trailer. Brake applied, TBC slider applied, truck in neutral or drive makes no difference, there has been no successful way to 'engage' the TRM module to send the 12v signal. I've tried tricking the module by hooking up a booster pack to the batteries on the trailer, then shutting off the booster pack so the truck would see a voltage drop/draw and enable the 12v, no luck. I've traced the wires, found the wires from the trailer plug to the trailer dist. box, to the batteries, everything shares voltages the same when i move the booster around and move the multimeter around, so the wiring all seems to be correct but I cannot get the truck to spit out 12v to charge!!
Any more ideas before cutting up the factory harness to run an upfitter switch with dedicated power from the battery?
Thanks everyone!
Hotshot
Joined: Jan 2010
Posts: 10,060
Likes: 491
From: Bristol, TN.
I'm still trying to sort this out...
I've got no 12v from the truck to the trailer. Brake applied, TBC slider applied, truck in neutral or drive makes no difference, there has been no successful way to 'engage' the TRM module to send the 12v signal. I've tried tricking the module by hooking up a booster pack to the batteries on the trailer, then shutting off the booster pack so the truck would see a voltage drop/draw and enable the 12v, no luck. I've traced the wires, found the wires from the trailer plug to the trailer dist. box, to the batteries, everything shares voltages the same when i move the booster around and move the multimeter around, so the wiring all seems to be correct but I cannot get the truck to spit out 12v to charge!!
Any more ideas before cutting up the factory harness to run an upfitter switch with dedicated power from the battery?
Thanks everyone!
I've got no 12v from the truck to the trailer. Brake applied, TBC slider applied, truck in neutral or drive makes no difference, there has been no successful way to 'engage' the TRM module to send the 12v signal. I've tried tricking the module by hooking up a booster pack to the batteries on the trailer, then shutting off the booster pack so the truck would see a voltage drop/draw and enable the 12v, no luck. I've traced the wires, found the wires from the trailer plug to the trailer dist. box, to the batteries, everything shares voltages the same when i move the booster around and move the multimeter around, so the wiring all seems to be correct but I cannot get the truck to spit out 12v to charge!!
Any more ideas before cutting up the factory harness to run an upfitter switch with dedicated power from the battery?
Thanks everyone!
Also that charge lead on the truck has to be fused somewhere. Fuse is good? Again just trying to check the obvious.
I would not jump to modifying simply because lots of folks have these trucks and complaints like this are really uncommon.
Steve
Junior User
Joined: Aug 2015
Posts: 87
Likes: 2
From: West Canada eh
Found the stupid thing... hours later and I now have 13.5v out the tail end. This was what helped me;
https://www.ford-trucks.com/forums/1...f-truck-3.html
The Ford response on that says check F65 (Which in our SD owners manual is listed as; Trailer Tow Lighting Module). Well it clearly isn't only a 'lighting' module, replaced the 30A fuse with the one from the pass seat adjustments and voila 13.5v out the back.
BTW RV'ers and trailer people, this 30A fuse is a MINI square block style, ordered 5 from Ford dealer yesterday explained to him 7 times how they were smaller than square block style, still sent me the wrong ones. I will get Ford part # or parts store part # and update this thread, grab spares of these for sure!!!
https://www.ford-trucks.com/forums/1...f-truck-3.html
The Ford response on that says check F65 (Which in our SD owners manual is listed as; Trailer Tow Lighting Module). Well it clearly isn't only a 'lighting' module, replaced the 30A fuse with the one from the pass seat adjustments and voila 13.5v out the back.
BTW RV'ers and trailer people, this 30A fuse is a MINI square block style, ordered 5 from Ford dealer yesterday explained to him 7 times how they were smaller than square block style, still sent me the wrong ones. I will get Ford part # or parts store part # and update this thread, grab spares of these for sure!!!
Hotshot
Joined: Jan 2010
Posts: 10,060
Likes: 491
From: Bristol, TN.
Found the stupid thing... hours later and I now have 13.5v out the tail end. This was what helped me;
https://www.ford-trucks.com/forums/1...f-truck-3.html
The Ford response on that says check F65 (Which in our SD owners manual is listed as; Trailer Tow Lighting Module). Well it clearly isn't only a 'lighting' module, replaced the 30A fuse with the one from the pass seat adjustments and voila 13.5v out the back.
BTW RV'ers and trailer people, this 30A fuse is a MINI square block style, ordered 5 from Ford dealer yesterday explained to him 7 times how they were smaller than square block style, still sent me the wrong ones. I will get Ford part # or parts store part # and update this thread, grab spares of these for sure!!!
https://www.ford-trucks.com/forums/1...f-truck-3.html
The Ford response on that says check F65 (Which in our SD owners manual is listed as; Trailer Tow Lighting Module). Well it clearly isn't only a 'lighting' module, replaced the 30A fuse with the one from the pass seat adjustments and voila 13.5v out the back.
BTW RV'ers and trailer people, this 30A fuse is a MINI square block style, ordered 5 from Ford dealer yesterday explained to him 7 times how they were smaller than square block style, still sent me the wrong ones. I will get Ford part # or parts store part # and update this thread, grab spares of these for sure!!!
Steve
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