Need Advice/Help with RV cable install

[B4000 RVer]

Hi folks,

I am about to add a 7 wire cable for my small truck camper. I have a 1997 Mazda B4000. I have a 7 pin round connector on the camper. The problem is that I am not that familiar with the location of the wires I need to change on the truck nor how to wire to the ignition. I am running cables to the camper that need to tap into the Marker/running lights, brake light, and possibly backup. I am also running a power wire to feed the camper fridge that needs to go to the ignition or a relay triggered by the ignition so it only gets power when the engine is running. Lastly I am running an 8 gauge ground/common and power line to connect the battery in the camper to the one in the truck. I was wondering what was easier, hooking up an isolator or a solenoid. Suggestions like the best place to find the wires for the marker lights, or how to tap the ignition to provide power while the truck is on using either a relay or directly. I've done plenty or rewiring on the back of the truck putting backup lights in or adding a backup camera and similar projects but I am new to working with the front harnesses. Any help or suggestions are appreciated.

Thanks,

 

[Grey_04]

here's some reading you may find useful..
http://www.therangerstation.com/tech_library/TrailerLights.html

 

[B4000 RVer]

Thanks for the link, but I still need help

That information is great and I've used it to wire a rear trailer plug in the past. However, my current project is the installation of a 7 wire cable from the camper connector at the front of the truck bed behind the driver running under the cab into the engine compartment. I need to tap into wires and do installations in the front of the truck under the hood for brake lights, running lights, and a relay off the ignition for the RV fridge, as well as hooking up a battery isolator or solenoid. I am not sure where the ignition wire I need to tap into to run to the relay trigger is or where I should tap into the running, and brake lights. I think the running light wiring will be easier to find at the left front marker, but I am less certain where a brake light is up there. I have no idea where the ignition wire runs. Any help where to look is appreciated.