Posted 2009-09-17 7:21 AM (#110788 - in reply to #110787) Subject: RE: DIY battery wiring ???
Extreme Veteran
Posts: 406 Location: Minneapolis, MN
Depends...but most late model trucks, that have the optional trailer towing package installed, will have a "pin" on the 7 way connector that is capable of this.
So you need to trace this wire into your trailer wiring harness and route that wire to the positive side of the battery.
My hot wire from the truck is wired directly to the trailer battery through the trailer plug.... use a test light/volt meter to trace out your wiring. Use the link above to help sort out how your vehicle is wired.
On the GM trucks, there's a "big" 40 amp fuse underneath the hood on the drivers side inside the fuse box/block on the left fender well. Fuse has to be in place for the "hot lead" inside the truck trailer plug to be energized. Plug is hot all the time. Truck's ignition switch does not have to be on to energize/charge trailer battery, it is continously drawing off the truck battery as long as the trailer cord is plugged into the truck. This is for 2001 and later GM.... Not sure about Ford or Dodge....
Posted 2009-09-17 12:41 PM (#110804 - in reply to #110796) Subject: RE: DIY battery wiring ???
Expert
Posts: 2958 Location: North Carolina
Originally written by sidelock on 2009-09-17 7:53 AM
Gary , is it possible for the batteries to charge if the ignition switch is not turned on ?
NO... unless the truck has been "Hot" wired by the crooks as they drive away with your rig. Seriously, the engine has to be running to create charging voltage. Otherwise you're just getting power from the truck battery.
Posted 2009-09-17 4:39 PM (#110814 - in reply to #110787) Subject: RE: DIY battery wiring ???
Elite Veteran
Posts: 720
On the newer Fords ('99 & up) the "batt" or "Acc" (same circuit, two common names) circuit carries a relay, and dies when the key is off. The GM stays hot full time. I believe that's what was being referred to earlier.
Posted 2009-09-17 5:04 PM (#110816 - in reply to #110814) Subject: RE: DIY battery wiring ???
Expert
Posts: 3802 Location: Rocky Mount N.C.
Originally written by horsey1 on 2009-09-17 5:39 PM
On the newer Fords ('99 & up) the "batt" or "Acc" (same circuit, two common names) circuit carries a relay, and dies when the key is off. The GM stays hot full time. I believe that's what was being referred to earlier.
That is correct.
It's hard to tell someone how something works when we don't know what make and model vehicle one has.... I.E. GM, FoMoCo, Chrysler, Toyota, etc...
DIY battery wiring ???
