Community Forums

gssuperduty · 09-24-2007, 05:02 AM

Hello all
Got a question on the trailer plug of my 5th wheel.
1 of the pins , i believe if you are looking at the plud it should be on the right pin of the center notch,should have +12v. where does the wire come from, mine pin has 0 volts. direct from the battery or from the converter box. is there a fuse in line some where ?

thanks
gssuperduty

gssuperduty · 09-24-2007, 05:02 AM

Hello all
Got a question on the trailer plug of my 5th wheel.
1 of the pins , i believe if you are looking at the plud it should be on the right pin of the center notch,should have +12v. where does the wire come from, mine pin has 0 volts. direct from the battery or from the converter box. is there a fuse in line some where ?

thanks
gssuperduty

Miken · 09-24-2007, 05:38 AM

If your talking about the plug from your truck, It is a hot wire from your battery, but it should be fused. On my Ford, the fuse is located in the engine compartment.

JimmyDee · 09-24-2007, 05:53 AM

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">On my Ford, the fuse is located in the engine compartment. </div></BLOCKQUOTE>
Requires a 30 amp. If you are using the pre wired harness for the brake controller, its located in the same place and is a 30 amp as well.
Jim

John Hilley · 09-24-2007, 07:20 AM

If you are looking at the trailer plug it should be the connection in the 2 o'clock position. It should be connected to the battery for charging while driving. The pin you are referring to should be right turn/stop.

gssuperduty · 09-24-2007, 09:24 AM

yes the pin at the 2:00 position. there should be +12v there, mine has 0v. why ? Are you saying this wire charges my trailer battery from my truck while towing.......

gssuperduty

rclarke · 09-24-2007, 12:42 PM

That does sound like the charge wiring for the trailer batteries. On Fords the circuit is fused in the fuse box under the hood. There is also a relay that closes when the key is on so that you won't run down the start batteries if you don't disconnect the trailer. So that wire will only be hot when the key is on in the truck.

ParTheCourse · 09-24-2007, 01:32 PM

Maybe this will help?

http://www.accessconnect.com/trailer_wiring_diagram.htm

Scroll down to 7 pin diagram

gssuperduty · 09-24-2007, 03:23 PM

Perfect diag.

ok on the trailer side, where does pin 4 get 12 volts from ?

Hitchhiker · 09-24-2007, 03:39 PM

That line will ultimately lead to the positive side of the battery so the truck's charging circuit can replenish the trailer's battery. If you don't have any voltage there check for a good ground and then look for a fuse or circuit breaker in the line. Whether it's a fuse or breaker varies between manufactures, but I'd say you probably have a 50 amp breaker in there someplace.