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Addtional Backup Lights

Discussion in 'Strobe Lighting' started by 04f250xlt, Nov 27, 2007.

  1. 04f250xlt

    04f250xlt Junior Member
    Messages: 28

    I want install a pair of Hella H3 lights under my trail hitch. I wasn’t aware that the lights had a relay.. How do I wire the lights so that they turn ON with the switch in the cab and when I put the truck in reverse??




    Wiring Installation
    CAUTION: Route wires away from moving parts or excessive heat.
    1. Locate the low beam or high beam lead on one headlamp by using a circuit tester. Use the following procedure:
    a. For Fog Lamps: Turn on the low beam headlamps. Connect the end of the circuit tester to ground (-) and use the tester to locate
    the headlamp low beam lead. Turn off the ignition and the headlamps. Disconnect the battery.
    b. For Driving Lamps: Turn on the high beam headlamps. Connect the end of the circuit tester to ground (-) and use the tester to
    locate the headlamp high beam lead. Turn off the ignition and the headlamps. Disconnect the battery.
    2. Scotch-lock the bare end of the GREEN wire to the low or high beam lead. Connect the other end of the GREEN wire to the green
    switch wire terminal.
    3. Attach the BLUE wires from the lamps to the vehicle ground.
    4. Position the relay upright on the battery side of the engine compartment in an area that is not exposed to water spray, excessive heat,
    or moving parts. Make sure the relay is mounted close enough to the battery so the RED power lead will easily reach the positive (+)
    terminal of the battery.
    5. Connect the RED wire to the positive (+) battery terminal and to the relay terminal labeled 30.
    6. Route the BLACK wires from the lamps to the relay. Connect the BLACK wire to the lamp terminals and to the relay terminal labeled
    87.
    7. Connect one BLUE lead to the vehicle ground and to the relay terminal labeled 85.
    8. Connect the other BLUE lead to the vehicle ground and to the blue switch terminal.
    9. Connect the YELLOW wire to the yellow switch wire terminal and to the relay terminal labeled 86.
    10. Test the operation of the lamps as follows: Re-connect the battery. Turn on ignition switch and low beam headlamps for Fog Lamps,
    or high beam headlamps for Driving Lamps. Activate auxiliary lamp switch. If lamps do not illuminate, check fuses and all wiring
    connections.
    11. Use wire ties to secure any slack portion of the harness in the engine compartment away from moving parts or excessive heat.

    Lights.JPG
     
  2. Brian Young

    Brian Young PlowSite Veteran
    Messages: 3,382

    Looks like your going to have to get a 3 way switch (off, on manually, and tie into reverse switch). Ive always tied into a reverse wire on my older truck. My 06 SD, I have 2 lights on my salt spreader and I just wire them together and run it to a 7 prong female trailer connector that plugs into my hitch, unfourtunatley they come on only with the tail light/head lights but they point almost straight down so drivers are not blinded by it.
     
  3. BlueLine Ent

    BlueLine Ent Senior Member
    Messages: 570

    Very simple. The wire that you have to activate the relay you hook to the switch on the dash. Then just tap off the reverse light feed into that wire, and they will also activate with the reverse lights. Thats the simple way of doing it. Both sets of backup lights will come on with the switch as well now. Look me up if you need some help, I'm in Danvers.
     
  4. yamaguy

    yamaguy Senior Member
    Messages: 556

    Right, but you should run a diode on the switched lead so the power does not back feed. Take a look here http://www.ford-trucks.com/forums/5...ghts-mounted-with-pics.html?highlight=stealth It is a great thread about it.
     
    Last edited: Nov 27, 2007
  5. 04f250xlt

    04f250xlt Junior Member
    Messages: 28

  6. yamaguy

    yamaguy Senior Member
    Messages: 556

    check out the link I posted. It goes over it pretty well.
     
  7. 02DURAMAX

    02DURAMAX PlowSite.com Addict
    Messages: 1,229

    Anyone else change there back up bulbs to LED's??....I just did ths and WOW can you tell the difference!!!

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  8. Supper Grassy

    Supper Grassy Senior Member
    Messages: 948

    The LEDS look great
     
  9. DeereFarmer

    DeereFarmer PlowSite Veteran
    Messages: 3,296

    How much did that run you Duramax?
     
  10. 02DURAMAX

    02DURAMAX PlowSite.com Addict
    Messages: 1,229

    25.00 on ebay...He has more if you want them..
     
  11. Bill 211

    Bill 211 Member
    Messages: 40

    are you sure you even need the relay? i've got h3 back up lights & their just spliced into the reverse light wire in the rear, never had a problem , just got 2 hella 55w flood lights , i plan on running them without a relay , i'm just going to use a switch that can handle 20 amps & run a fuse in the middle
     
  12. DeereFarmer

    DeereFarmer PlowSite Veteran
    Messages: 3,296

    Do you have a link? That'd be great. Thanks!
     
  13. c.schulz

    c.schulz Senior Member
    Messages: 202

    This was the system I used to wire my lights. Works great. Triggers with reverse lights or constant on.

    Chris
    [​IMG]
     
  14. Omaha Plowboy

    Omaha Plowboy Member
    Messages: 66

    I cheated, I turned the ally light in my lightbar (old cop car lightbar) to face backwards. Made my own switch box. Simple 4 switches. rotators, wig-wags, take downs (forward lights), and the alleys (rear facing now).
     
  15. 02DURAMAX

    02DURAMAX PlowSite.com Addict
    Messages: 1,229

  16. DeereFarmer

    DeereFarmer PlowSite Veteran
    Messages: 3,296

    Thanks Duramax!
     
  17. bersh

    bersh Senior Member
    Messages: 169

    You can run them off the reverse lights, but you do run the risk of frying the thin factory wire by drawing that much current. If you do go this way and you're running two lights, feed each one separately to the corresponding factory reverse light. I know guys that have been running work lights off their reverse lights for years without any issues, but I also kno of a couple that have fried some things as well. For me, it just isn't worth the risk. Wiring the relay looks a lot more complicated in a diagram than it is in practice. Plus, by using a good 12 v feed and a relay, you are delivering the full voltage to the additional lamps which in turn will allow them to work the way they are supposed to.

    As far as running a long wire carrying the full current, I'd run 10 ga. wire (you could get by with 12 ga. but will have more voltage drop) from the battery with a 30 amp switch (it will get very hot) all the way back to the lights. However, by the time you do this you're probably better off money and labor wise just wiring in a relay.