Trailer Wiring install '71 F250 Fummins

[IBMobile]

22 hours ago, Bacon Creek Metal said:

I don't recall what numbers the headlights are,  I swapped in Jeep JK headlights.  I would like to be able to run higher powered bulbs.

 

 

This is to put you headlights on a rely and take the high amp load off of the headlight switch.

If you're running H6024 halogen blubs then the high beam amp load would be about 10 amps at the switch.  With the relay it will be about .2 amps.  18-16 gauge wire will be fine with a 15 amp fuse.   The fuse and relay can be mounted in the spare PDC. 

 

Cut the red/yellow wire about 2"-3" from the connector at the headlight switch.  Connect the red/yellow wire from the head light switch to terminal #86 of the relay.  This is used to energize the relay solenoid.

Connect terminal #87 of the relay to the red/yellow wire that is left and goes to the headlight dimmer switch.  This will bring battery power to the head lights when the head light switch is turned on.   

 

I'll have another diagram for the brake controller tomorrow, I hope. 

 

In the diagram below the wire runs are numbered with the number corresponding to a color.

 

[IBMobile]

Trailer brake controller installation is straight forward following the instructions provided by Tekonsha.  I'd use the 20 amp auto-reset circuit breaker and the black, white and blue wires be 12 gauge with all connections soldered and sealed.

 

[IBMobile]

                           CONNECTOR                        TRUCK

#     FUCTION         COLOR      GAUGE ---    #              COLOR

1  GROUND              WHITE       12-10 ---    ADDED     WHITE

2  TRAILER BRAKE  BLUE         12      ---    ADDED      BLUE

3  TAIL/MARKER       BROWN    16      ---     285            BROWN

4  BATTERY              RED           12-10 ---    ADDED      RED

5  L-TURN/BRAKE    YELLOW    16      ---    283            YELLOW/BLACK

6  R-TURN/BRAKE   GREEN       16      ---    282            GREEN

7  BACK-UP/AUX     ORANGE     16     ---     ADDED     ORANGE

 

 

The red wire is use to recharge the trailer battery and supply added power for additional equipment such as a power winch.  Determine the load and install 12-10 gauge wire with a corresponding 20 to 30 amp auto-reset circuit breaker.  

 

The added white wire is used to ground the trailer's electrical system to the truck's electrical system.  The wire gauge should be the same size as the largest power wire, brake or battery, 12-10 gauge.  Grounding the white wire at the battery negative terminal will give the best system performance.   

 

The wires for the trailer's turn signal/brake, marker/tail and back-up lights can be run to and fused in the extra PDC before going to the extra pin connector.  Indicated below are a couple of places the truck wire harness can be spliced into for these lights.   

 

 

[Bacon Creek Metal]

IBMobile, You, sir, are my hero.  I need to get this printed up and get caught up in the shop so I can get this done before I need to drive this beast in the Spring.  I've been fighting retarded amounts of snow accumulation this week.

 

Thank you, thank you, thank you